One of the major problems encountered in time travel is not that of accidentally becoming your own father or mother. There is no problem involved in becoming your own father or mother that a broadminded and well-adjusted family can't cope with.

Let us think the unthinkable, let us do the undoable, let us prepare to grapple with the ineffable itself, and see if we may not eff it after all.

I rarely end up where I was intending to go, but often I end up somewhere I needed to be.

In the beginning the Universe was created. This has made a lot of people very angry and been widely regarded as a bad move.

A nerd is someone who uses a telephone to talk to other people about telephones.

I wrote an ad for Apple Computer: "Macintosh - We might not get everything right, but at least we knew the century was going to end".

But for a moment Dirk had a sense of inifinite loss and sadness that somewhere among the frenzy of information noise that daily rattled the lives of men he thought he might have heard a few notes that denoted the movements of gods.