Brains are no good if you don't use them.

I finished by saying that it struck me that all the ethical systems I was discussing were after the fact. That is, that people act as they are disposed to, but they like to feel afterwards that they were right and so they invent systems that approve of their dispositions.

This is what makes science so hard, and ultimately so fun. Think of the limits of what we know as a great suite of rooms inhabited by vast numbers of incredibly busy, incredibly messy, nearsighted people, all of whom are eccentric recluses.

Maturity is the ability to sort the portions of truth from the accepted lies and self-deceptions that you have grown up with.

There is a lesson that I learned at twelve - the world does not end at the edge of a quad. There are people outside. The world does not end on the Fourth Level. There are people elsewhere. It took me two years to learn to apply the lesson - that neither does the world end with the Ship. If you want to accept life, you have to accept the whole bloody universe. The universe is filled with people, and there is not a single solitary spear carrier among them.

Brains are no good if you don't use them.

You can't stamp on people and not get hurt in return.