Service means you must take order from the master. That is service. Otherwise it is mental concoction. Actually, the servant requests, “How can I serve you?” So when the master orders, “You serve me like this,” then you do that, that is service. And if you manufacture your service, that is not service. That is your sense gratification. Yasya prasadad bhagavat-praadah. You have to see how he is pleased. Now if he wants a glass of water and if you bring a nice glass of milk, you can say milk is better than water, you take it. That is not service. He wants water, you give him water. Don’t manufacture better thing.

Srila Prabhupada; Lecture, Bhagavad-gita 15.15, August 5, 1976, New Mayapur, France