Love is not everything ... It is only when we are young that we think it is.

It is odd how, when you have a secret belief of your own which you do not wish to acknowledge, the voicing of it by someone else will rouse you to a fury of denial.

... evil was, perhaps, necessarily always more impressive than good.

It's astonishing in this world how things don't turn out at all the way you expect them to.

But I know human nature, my friend, and I tell you that, suddenly confronted with the possibility of being tried for murder, the most innocent person will lose his head and do the most absurd things.

I am not one to rely upon the expert procedure. It is the psychology I seek, not the fingerprint or the cigarette ash.

There is no detective in England equal to a spinster lady of uncertain age with plenty of time on her hands.