Write what you need to write, not what is currently popular or what you think will sell.

If our sex life were determined by our first youthful experiments, most of the world would be doomed to celibacy. In no area of human experience are human beings more convinced that something better can be had only if they persevere.

There is no point in regretting any part of the past. The past can't now be altered, the future has yet to be lived, and consciously to experience every moment of the present is the only way to gain at least the illusion of immortality.

Of the four billion life forms which have existed on this planet, three billion, nine hundred and sixty million are now extinct. We don't know why. Some by wanton extinction, some through natural catastrophe, some destroyed by meteorites and asteroids. In the light of these mass extinctions it really does seem unreasonable to suppose that Homo sapiens should be exempt. Our species will have been one of the shortest-lived of all, a mere blink, you may say, in the eye of time.

You never forget the people who were kind to you in childhood, do you, sir?

Can we ever break free of the devices and desires of our own hearts? Might not our conscience be telling us what we most want to hear?

No literary form is more revealing, more spontaneous or more individual than a letter.