The word yoga has become very popular in todays vocabulary, but we understand from the Bhagavad-gita the real definition of the word, and its ultimate goal.

A yogī is greater than the ascetic, greater than the empiricist and greater than the fruitive worker. Therefore, O Arjuna, in all circumstances, be a yogī. (Bg. 6.46)

And of all yogīs, he who always abides in Me with great faith, worshiping Me in transcendental loving service, is most intimately united with Me in yoga and is the highest of all. (Bg. 6.47)

When we speak of yoga we refer to linking up our consciousness with the Supreme Absolute Truth. Such a process is named differently by various practitioners in terms of the particular method adopted. When the linking up process is predominantly in fruitive activities, it is called karma-yoga, when it is predominantly empirical, it is called jñāna-yoga, and when it is predominantly in a devotional relationship with the Supreme Lord, it is called bhakti-yoga. Bhakti-yoga or Kṛṣṇa consciousness is the ultimate perfection of all yogas (from purport to Bg. 6.46)

The culmination of all kinds of yoga practices lies in bhakti-yoga. All other yogas are but means to come to the point of bhakti in bhakti-yoga. Yoga actually means bhakti-yoga; all other yogas are progressions toward the destination of bhakti-yoga. From the beginning of karma-yoga to the end of bhakti-yoga is a long way to self-realization. Karma-yoga, without fruitive results, is the beginning of this path. When karma-yoga increases in knowledge and renunciation, the stage is called jñāna-yoga. When jñāna-yoga increases in meditation on the Supersoul by different physical processes, and the mind is on Him, it is called aṣṭāṅga-yoga. And, when one surpasses the aṣṭāṅga-yoga and comes to the point of the Supreme Personality of Godhead Kṛṣṇa, it is called bhakti-yoga, the culmination. Factually, bhakti-yoga is the ultimate goal (from purport to Bg. 6.47)

full texts and purports

Bhagavad-gītā As It Is
by His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda

Chapter Six, Text 46-47

TEXT 46

tapasvibhyo ’dhiko yogī
jñānibhyo ’pi mato ’dhikaḥ
karmibhyaś cādhiko yogī
tasmād yogī bhavārjuna

tapasvibhyaḥ—than the ascetic; adhikaḥ—greater; yogī—the yogī; jñānibhyaḥ—than the wise; api—also; mataḥ—considered; adhikaḥ—greater than; karmibhyaḥ—than the fruitive worker; ca—also; adhikaḥ—greater than; yogī—the yogī; tasmāt—therefore; yogī—a transcendentalist; bhava—just become; arjuna—O Arjuna.

TRANSLATION

A yogī is greater than the ascetic, greater than the empiricist and greater than the fruitive worker. Therefore, O Arjuna, in all circumstances, be a yogī.

PURPORT

When we speak of yoga we refer to linking up our consciousness with the Supreme Absolute Truth. Such a process is named differently by various practitioners in terms of the particular method adopted. When the linking up process is predominantly in fruitive activities, it is called karma-yoga, when it is predominantly empirical, it is called jñāna-yoga, and when it is predominantly in a devotional relationship with the Supreme Lord, it is called bhakti-yoga. Bhakti-yoga or Kṛṣṇa consciousness is the ultimate perfection of all yogas, as will be explained in the next verse. The Lord has confirmed herein the superiority of yoga, but He has not mentioned that it is better than bhakti-yoga. Bhakti-yoga is full spiritual knowledge, and as such, nothing can excel it. Asceticism without self-knowledge is imperfect. Empiric knowledge without surrender to the Supreme Lord is also imperfect. And fruitive work without Kṛṣṇa consciousness is a waste of time. Therefore, the most highly praised form of yoga performance mentioned here is bhakti-yoga, and this is still more clearly explained in the next verse.

TEXT 47

yoginām api sarveṣāṁ
mad-gatenāntar-ātmanā
śraddhāvān bhajate yo māṁ
sa me yuktatamo mataḥ

yoginām—of all yogīs; api—also; sarveṣām—all types of; mat-gatena—abiding in Me; antaḥ-ātmanā—always thinking of Me within; śraddhāvān—in full faith; bhajate—renders transcendental loving service; yaḥ—one who; mām—Me (the Supreme Lord); saḥ—he; me—Mine; yuktatamaḥ—the greatest yogī; mataḥ—is considered.

TRANSLATION

And of all yogīs, he who always abides in Me with great faith, worshiping Me in transcendental loving service, is most intimately united with Me in yoga and is the highest of all.

PURPORT

The word bhajete is significant here. Bhajete has its root in the verb bhaj, which is used when there is need of service. The English word “worship” cannot be used in the same sense as bhaja. Worship means to adore, or to show respect and honor to the worthy one. But service with love and faith is especially meant for the Supreme Personality of Godhead. One can avoid worshiping a respectable man or a demigod and may be called discourteous, but one cannot avoid serving the Supreme Lord without being thoroughly condemned. Every living entity is part and parcel of the Supreme Personality of Godhead, and thus every living entity is intended to serve the Supreme Lord by his own constitution. Failing to do this, he falls down. The Bhāgavatam confirms this as follows:

ya eṣāṁ puruṣaṁ sākṣād ātma-prabhavam īśvaram
na bhajanty avajānanti sthānād bhraṣṭā patanty adhaḥ

“Anyone who does not render service and neglects his duty unto the Primeval Lord, who is the source of all living entities, will certainly fall down from his constitutional position.”

In this verse also the word bhajanti is used. Therefore, bhajanti is applicable to the Supreme Lord only, whereas the word “worship” can be applied to demigods or to any other common living entity. The word avajānanti, used in this verse of Śrīmad-Bhāgavatam, is also found in the Bhagavad-gītā: avajānanti māṁ mūḍhāḥ: “Only the fools and rascals deride the Supreme Personality of Godhead Lord Kṛṣṇa.” Such fools take it upon themselves to write commentaries on the Bhagavad-gītā without an attitude of service to the Lord. Consequently they cannot properly distinguish between the word bhajanti and the word “worship.”

The culmination of all kinds of yoga practices lies in bhakti-yoga. All other yogas are but means to come to the point of bhakti in bhakti-yoga. Yoga actually means bhakti-yoga; all other yogas are progressions toward the destination of bhakti-yoga. From the beginning of karma-yoga to the end of bhakti-yoga is a long way to self-realization. Karma-yoga, without fruitive results, is the beginning of this path. When karma-yoga increases in knowledge and renunciation, the stage is called jñāna-yoga. When jñāna-yoga increases in meditation on the Supersoul by different physical processes, and the mind is on Him, it is called aṣṭāṅga-yoga. And, when one surpasses the aṣṭāṅga-yoga and comes to the point of the Supreme Personality of Godhead Kṛṣṇa, it is called bhakti-yoga, the culmination. Factually, bhakti-yoga is the ultimate goal, but to analyze bhakti-yoga minutely one has to understand these other yogas. The yogī who is progressive is therefore on the true path of eternal good fortune. One who sticks to a particular point and does not make further progress is called by that particular name: karma-yogī, jñāna-yogī or dhyāna-yogī, rāja-yogī, haṭha-yogī, etc. If one is fortunate enough to come to the point of bhakti-yoga, it is to be understood that he has surpassed all the other yogas. Therefore, to become Kṛṣṇa conscious is the highest stage of yoga, just as, when we speak of Himalayan, we refer to the world’s highest mountains, of which the highest peak, Mount Everest, is considered to be the culmination.

It is by great fortune that one comes to Kṛṣṇa consciousness on the path of bhakti-yoga to become well situated according to the Vedic direction. The ideal yogī concentrates his attention on Kṛṣṇa, who is called Śyāmasundara, who is as beautifully colored as a cloud, whose lotus-like face is as effulgent as the sun, whose dress is brilliant with jewels and whose body is flower garlanded. Illuminating all sides is His gorgeous luster, which is called the brahmajyoti. He incarnates in different forms such as Rāma, Nṛsiṁha, Varāha and Kṛṣṇa, the Supreme Personality of Godhead, and He descends like a human being, as the son of Mother Yaśodā, and He is known as Kṛṣṇa, Govinda and Vāsudeva. He is the perfect child, husband, friend and master, and He is full with all opulences and transcendental qualities. If one remains fully conscious of these features of the Lord, he is called the highest yogī.

This stage of highest perfection in yoga can be attained only by bhakti-yoga, as is confirmed in all Vedic literature:

yasya deve parā bhaktir yathā deve tathā gurau.
tasyaite kathitā hy arthāḥ prakāśante mahātmanaḥ

“Only unto those great souls who have implicit faith in both the Lord and the spiritual master are all the imports of Vedic knowledge automatically revealed.”

Bhaktir asya bhajanaṁ tadihāmutropādhi nairāsyenāmuṣmin manaḥ kalpanam; etad eva naiṣkarmyam. “Bhakti means devotional service to the Lord which is free from desire for material profit, either in this life or in the next. Devoid of such inclinations, one should fully absorb the mind in the Supreme. That is the purpose of naiṣkarmya.”

These are some of the means for performance of bhakti or Kṛṣṇa consciousness, the highest perfectional stage of the yoga system.