The human mind prefers to be spoon-fed with the thoughts of others, but deprived of such nourishment it will, reluctantly, begin to think for itself - and such thinking, remember, is original thinking and may have valuable results.

It often seems to me that's all detective work is, wiping out your false starts and beginning again." Yes, it is very true, that. And it is just what some people will not do. They conceive a certain theory, and everything has to fit into that theory. If one little fact will not fit it, they throw it aside. But it is always the facts that will not fit in that are significant.

Most successes are unhappy. That's why they are successes - they have to reassure themselves about themselves by achieving something that the world will notice.

I have wanted . . . to commit a murder myself. I recognized this as the desire of the artist to express himself! . . . But-incongruous as it may seem to some-I was restrained and hampered by my innate sense of justice. The innocent must not suffer.

There was a moment when I changed from an amateur to a professional. I assumed the burden of a profession, which is to write even when you don't want to, don't much like what you're writing, and aren't writing particularly well

Curious things, habits. People themselves never knew they had them. [Witness for the Prosecution, also published in The Hound of Death and Other Stories.]

The truth often does sound unconvincing.