From a writer's point of view, Twitter is an app for the forced publication of early drafts. - Paul Graham

when customers tell you why they won't buy your product, that you should listen to. They can occasionally be mistaken, but not as often, and there is an iterative process for converging on the truth.

If we ever undertake multi-generation trips to distant stars, the initial crew will be optimistic enthusiasts, but their grandchildren will have reverted to the mean and will curse their grandparents for consigning them to live and die aboard a spaceship.

The most important thing is to be able to think what you want, not to say what you want.