Idealism easily becomes dangerous because it brings with it, almost inevitably, the belief that the ends justify the means. If you are fighting for good or for God, what matters is the outcome, not the path. People have little respect for rules; we respect the moral principles that underlie most rules. But when a moral mission and legal rules are incompatible, we usually care more about the mission.

The emotion of disgust evolved initially to optimize responses to the omnivore's dilemma. Individuals who had a properly calibrated sense of disgust were able to consume more calories than their overly disgustable cousins while consuming fewer dangerous microbes than their insufficiently disgustable cousins.

Aristotle asked about aretē (excellence/virtue) and telos (purpose/goal), and he used the metaphor that people are like archers, who need a clear target at which to aim.13 Without a target or goal, one is left with the animal default: Just let the elephant graze or roam where he pleases. And because elephants live in herds, one ends up doing what everyone else is doing. Yet the human mind has a rider, and as the rider begins to think more abstractly in adolescence, there may come a time when he looks around, past the edges of the herd, and asks: Where are we all going? And why?

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The two biggest causes of evil are two that we think are good, and that we try to encourage in our children: high self-esteem and moral idealism. Having high self-esteem doesn’t directly cause violence, but when someone’s high esteem is unrealistic or narcissistic, it is easily threatened by reality; in reaction to those threats, people — particularly young men — often lash out violently.

I don’t want you to be safe ideologically. I don’t want you to be safe emotionally. I want you to be strong. That’s different. I’m not going to pave the jungle for you. Put on some boots, and learn how to deal with adversity. I’m not going to take all the weights out of the gym; that’s the whole point of the gym. This is the gym.

life is a journey,” the metaphor guides you to some conclusions: You should learn the terrain, pick a direction, find some good traveling companions, and enjoy the trip, because there may be nothing at the end of the road.

Durkheim frequently criticized his contemporaries, such as Freud, who tried to explain morality and religion using only the psychology of individuals and their pairwise relationships. (God is just a father figure, said Freud.) Durkheim argued, in contrast, that Homo sapiens was really Homo duplex, a creature who exists at two levels: as an individual and as part of the larger society.

People don't adopt their ideologies at random, or by soaking up whatever ideas are around them. People whose genes gave them brains that get a special pleasure from novelty, variety, and diversity, while simultaneously being less sensitive to signs of threat, are predisposed (but not predestined) to become liberals.

From time to time in the years to come, I hope you will be treated unfairly, so that you will come to know the value of justice. I hope that you will suffer betrayal because that will teach you the importance of loyalty. Sorry to say, but I hope you will be lonely from time to time so that you don’t take friends for granted. I wish you bad luck, again, from time to time so that you will be conscious of the role of chance in life and understand that your success is not completely deserved and that the failure of others is not completely deserved either. And when you lose, as you will from time to time, I hope every now and then, your opponent will gloat over your failure. It is a way for you to understand the importance of sportsmanship. I hope you’ll be ignored so you know the importance of listening to others, and I hope you will have just enough pain to learn compassion. Whether I wish these things or not, they’re going to happen. And whether you benefit from them or not will depend upon your ability to see the message in your misfortunes.

We humans have an extraordinary ability to care about things beyond ourselves, to circle around those things with other people, and in the process to bind ourselves into teams that can pursue larger projects. That’s what religion is all about.