| Category | Quote | E-Mail this quote | | Honesty | The best measure of a man's honesty isn't his income tax return. It's the zero adjust on his bathroom scale.
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| Impossibility | The only way to discover the limits of the possible is to go beyond them into the impossible.
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| Intelligence | It has yet to be proven that intelligence has any survival value.
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| Possibilities | If an elderly but distinguished scientist says that something is possible he is almost certainly right, but if he says that it is impossible he is very probably wrong.
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| Space | There is hopeful symbolism in the fact that flags do not wave in a vacuum.
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| Technology | Any sufficiently advanced technology is indistinguishable from magic.
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