The Dhyana sloka in the Bhagvad Gita says: “Sarvo Upanishado Gaavo—all the Upanishads are cows; Dugdha Gopala Nandana—the one milks them is Krishna, the cowherd boy;
Partho Vatsaha—Partha or Arjuna is the calf (for whom the cow produces milk);
Sudhir Bohkta—the wise are the one who enjoy it; Dugdham Gita Amritam Mahat—the milk of immortality, the great nectar of immortality.”