This morning as I was heating up some hot milk to offer, I was reminded of something Srila Prabhupada said about drinking milk; ‘that we should drink milk “sipping hot” this will help develop the finer brain cells needed to understand spiritual subject matter’

I don’t have anything against vegans, rather I respect their endeavor to not promote violence against animals by refraining, but we are getting our milk from protected cows, and I view milk as one of the many gifts from God. Milk, yogurt, butter, ghee, and paneer (cheese curd), have all been used for thousands of years in Vedic cooking. And Krishna is also known as Makhan Chor (the butter thief) and is very fond of eating butter and yogurt, and is something that is offered daily in all the ISKCON temples

…Milk is compared to nectar, which one can drink to become immortal. Of course, simply drinking milk will not make one immortal, but it can increase the duration of one’s life. In modern civilization, men do not think milk to be important, and therefore they do not live very long. Although in this age men can live up to one hundred years, their duration of life is reduced because they do not drink large quantities of milk. This is a sign of Kali-yuga. In Kali-yuga, instead of drinking milk, people prefer to slaughter an animal and eat its flesh.

The Supreme Personality of Godhead, in His instructions of Bhagavad-gītā, advises go-rakṣya, which means cow protection. The cow should be protected, milk should be drawn from the cows, and this milk should be prepared in various ways. One should take ample milk, and thus one can prolong one’s life, develop his brain, execute devotional service, and ultimately attain the favor of the Supreme Personality of Godhead. As it is essential to get food grains and water by digging the earth, it is also essential to give protection to the cows and take nectarean milk from their milk bags. (purport to SB 8.6.12)

Full Text and Purport