(Prabhupada's lecture - Śrīmad-Bhāgavatam 1.15.51 - Los Angeles, December 28, 1973)
So you try to love God and you'll see that you're loving even an ant. There are many examples I can cite in the history, how a man became universal lover. I have told you many times the story of a hunter. The hunter was taking pleasure by killing animals half, and when the same hunter became a devotee, he was not prepared to kill even an ant. So this is love of Godhead. This is the science. The same hunter who was killing every day so many animals, when he became a great devotee of Lord, he was not willing—because he becomes vastly learned. To become lover of God means fully enlightened in consciousness. He sees that "Here is an ant. This living entity, a small living entity, is also part and parcel. By his own work, he has got this insignificant body as an ant. I have got this human form of body, but that does not make any difference between the soul and the soul." Paṇḍitāḥ sama-darśinaḥ [Bg. 5.18]. When it becomes actually... When a man becomes actually learned, he's sama-darśī. He sees everyone on the equal level.
I was seeing just this evening the Ten Commandments. Now, in the Ten Commandments, the one commandment is that "Thou shall not kill." But I am sorry to feel that killing propensity is so great in the Christian world. Why? Because there is lack of love of God. "Thou shall not kill." Now there is organized killing process. So I do not know how they are following the Christian principles. It is clearly stated, "Thou shall not kill. Thou shall not tease your neighbor." So why should I tease an animal neighbor? These defects are due to lack of love of God.