Everybody should stick to the insanity that God has seen fit to curse him with.

Yes," Mustapha Mond was saying, "that's another item in the cost of stability. It isn't only art that's incompatible with happiness; it's also science. Science is dangerous; we have to keep it most carefully chained and muzzled.

Individual insanity is immune to the consequences of collective insanity

If human beings were shown what they're really like, they'd either kill one another as vermin, or hang themselves.