God, our genes, our environment, or some stupid programmer keying in code at an ancient terminal - there's no way free will can ever exist if we as individuals are the result of some external cause.

Thank God for you, Ender. Thank God.

You take a step, then another. That's the journey. But to take a step with your eyes open is not a journey at all, it's a remaking of your own mind.

Ho said, 'I do not grieve because my feet have been cut off. I grieve because a precious jewel is dubbed a mere stone, and a man of integrity is called a deceiver. This is why I weep.'

Science isn't done by consensus. It's done by rigorous testing.

It will hurt." said Petra. "But let's make the most of what we have, and not let future pain ruin present happiness.

Truth, when we are fortunate enough to find it, is like bad-tasting medicine. It rarely comes as a pleasant surprise, because if it surprises us, it means we've been denying it for some time and have a lot of beliefs based on falsehood. It's hard to give up those beliefs.