People don't do things without a reason.

Some suggestions for you :

In conversation, points arise! If a human being converses much, it is impossible for him to avoid the truth!

When engaged in eating, the brain should be the servant of the stomach.

Natural affection is one thing, said Miss Ramsbottom, and I hope I've got as much of it as anyone. But I won't stand for wickedness. Wickedness has to be destroyed.

And that very same evening - that very same evening - Lord Edgware dies. Good title that, by the way. Lord Edgware Dies. Look well on a book stall.

Born poor doesn't mean you've got to stay poor. Money's queer. It goes where it's wanted.

First, you have to think and think and think and think; then you have to force yourself to write it down.

It is deplorable...to remove all the romance - all the mystery!

His poems have no capital letters in them, which is, I believe, the essence of modernity. His books are about unpleasant people leading lives of surpassing dullness.

Men are like that... They remain boys...

Do you know my friend that each one of us is a dark mystery, a maze of conflicting passions and desire and aptitudes?

But it is beautiful, my friend, said Hercule Poirot with admiration. So clear—so beautifully clear. You sound as if you were talking about soup, grumbled the inspector. It may be Consommé to you—but to me there's a good deal of thick Mock Turtle about it still.

You surprise me, Hastings. Do you not know that all celebrated detectives have brothers who would be even more celebrated than they are were it not for constitutional indolence?

But all the same, it is true what I say--artificial conditions bring about their natural reaction.

Everything must be taken into account. If the fact will not fit the theory---let the theory go.