Contemplate the marvel that is existence, and rejoice that you are able to do so.

Four things do not come back: the spoken word, the sped arrow, the past life, and the neglected opportunity.

Nothing erases the past. There is repentance, there is atonement, and there is forgiveness. That is all, but that is enough.

Science fiction is very well suited to asking philosophical questions; questions about the nature of reality, what it means to be human, how do we know the things that we think we know.

Physics admits of a lovely unification, not just at the level of fundamental forces, but when considering its extent and implications. Classifications like "optics" or "thermodynamics" are just straitjackets, preventing physicists from seeing countless intersections.

It is a misconception to think that during evolution humans sacrificed physical skill in exchange for intelligence: wielding one's body is a mental activity.

Brain damage is never a good idea, no matter what your friends say.