Reading computer manuals without the hardware is as frustrating as reading sex manuals without the software.

They had not yet attained the stupefying boredom of omnipotence; their experiments did not always succeed.

It was a pity that there was no radar to guide one across the trackless seas of life. Every man had to find his own way, steered by some secret compass of the soul. And sometimes, late or early, the compass lost its power and spun aimlessly on its bearings. Alan Bishop

The Earth would only have to move a few million kilometers sunward-or starward-for the delicate balance of climate to be destroyed. The Antarctic icecap would melt and flood all low-lying land; or the oceans would freeze and the whole world would be locked in eternal winter. Just a nudge in either direction would be enough.

The only way to define your limits is by going beyond them.

No trilogy should have more than four books.

Absolutely no religious rites of any kind, relating to any religious faith, should be associated with my funeral.