WATCH THOU FOR THE MUTANT ! - John Wyndham

You owe it to your self-respect to spend a lot of money on yourself.

There are, of course, risks. In fact, there are three distinct kinds of risk: the known ones which we can and shall prepare against; the known ones which we must trust to luck to avoid; and the entirely unknown.

"And it all comes of this gallivanting about the Universe. I never did think much of it. Stick to your own planet, is what I say; it's quite big enough. But will they? Not so's you'd notice it. They go flinging themselves into space, and then what happens?" He paused aggrievedly.