He was very much a man of moods, possibly owing to what is styled the artistic temperment. I have never seen, myself, why the possession of artistic ability should be supposed to excuse a man from a decent exercise of self-control.

It is completely unimportant. That is why it is so interesting.

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

And yet," said Poirot, "suppose an accident-" "Ah, no, my friend-" "From your point of view it would be regrettable, I agree. But nevertheless let us just for one moment suppose it. Then, perhaps, all these here are linked together - by death.

It's like all those quiet people, when they do lose their tempers they lose them with a vengeance.

Books are a habit-forming drug.

I'm sure you have a theme: the theme of your life. You can embellish it or desecrate it, but it's your theme, and as long as you follow it, you will experience harmony and peace of mind.