The stars incline, but do not impel.

To assess the intelligence of a committee, divide the IQ of its stupidest member by the number of members.

Men are more sentimental than women. It blurs their thinking.

Figure out for yourself what you want to be really good at, know that you'll never really satisfy yourself that you've made it, and accept that that's okay.

The best thing about space travel is that it made it possible to go elsewhere.

Don't ever become a pessimist... a pessimist is correct oftener than an optimist, but an optimist has more fun, and neither can stop the march of events.

Being right too soon is socially unacceptable.