People talk about what distinguishes humans from other animals. Very little, it turns out, except for matters of degree.
The one thing that I think is unique to humans is our ability to not follow the instincts programmed into us by evolution. No other animal is capable of that, I believe. We are all programmed to seek food, sex, and power, to accumulate stuff, to favor our kin over the "other", etc., all in the service of passing on our genes. When you see how many people out there are fat, greedy, and selfish, you realize that evolution's drives may lead to perpetuating your genes, but they do not lead to happiness.
But if you can understand where your impulses come from, where you are being driven, you can rebel and call a halt. So you can choose be faithful to your partner even when faced with the perfect opportunity to cheat and spread your genes some more. You can choose to give to people you'll never meet, half a world away, instead of hoarding everything for yourself and your offspring. You can even choose to not have offspring, or not even a mate.
I don't think it is a coincidence that those who choose to seek enlightenment over all else, in so many different religions and cultures, tend to be celibate and ascetic. You never hear of a philosopher millionaire.
So much suffering in the world is caused by people behaving like pond scum. But the way to break free from that is not to deny our animal nature, but to understand it. Hypocrisy and self-knowledge are mutually exclusive.