There are times when it is one's duty to assert oneself.

Some suggestions for you :

I learned (what I suppose I really knew already) that one can never go back, that one should not ever try to go back—that the essence of life is going forward. Life is really a One Way Street, isn't it?

Evil never goes unpunished, Monsieur. But the punishment is sometimes secret.

If you place your head in a lion's mouth, then you cannot complain one day if he happens to bite it off.

Many homicidal lunatics are very quiet, unassuming people. Delightful fellows.

Being in love has a very bad effect on men - it seems to addle their wits.

Death, mademoiselle, unfortunately creates a prejudice. A prejudice in favour of the deceased... There is a great charity always to the dead.

One of the saddest things in life, is the things one remembers.

Young men are sadly degenerate nowadays.

Plots come to me at such odd moments, when I am walking along the street, or examining a hat shop…suddenly a splendid idea comes into my head.

I am not mad. I am eccentric perhaps--at least certain people say so; but as regards my profession. I am very much as one says, 'all there.

Arrange your ideas. Be methodical. Be orderly. There is the secret of success.

I did not deceive you, mon ami. At most, I permitted you to deceive yourself.

The amount of missing girls I've had to trace and their family and their friends always say the same thing. 'She was a bright and affectionate disposition and had no men friends'. That's never true. It's unnatural. Girls ought to have men friends. If not, then there's something wrong about them....

I told you there was nothing to it, said Arbuthnot apologetically. But you know what it is—early hours of the morning—everything very still—the thing had a sinister look—like a detective story. All nonsense, really.