Unless one is very expert in killing animals, he's not bereft from Krsna consciousness. That means one who is very expert in killing, he cannot understand. Therefore Christ also said, "Thou shall not kill," the first business. Nobody will be able if one is a killer of animal, small or big, ultimately killer of his own children, killer of himself. The killing process is so nice that it goes up to the point of killing one's children. That is now happening. Killing business has so expanded that they are killing their own children. Just see the influence of Kali-yuga. The children, they take shelter of the father and mother, thinking very safe. Now, in this Kali-yuga, even there is no safety under the care of father and mother. Just see how this material civilization is progressing. Very, very dangerous.

(From Srila Prabhupada's lecture on Sri Caitanya-caritamrta, Adi-lila 1.13 — April 6, 1975, Mayapur)