The saddest thing in life and the hardest to live through, is the knowledge that there is someone you love very much whom you cannot save from suffering.
It is my experience that no one, in the course of conversation, can fail to give themselves away sooner or later. Everyone has an irresistible urge to talk about themselves.
Curious things, habits. People themselves never knew they had them. [Witness for the Prosecution, also published in The Hound of Death and Other Stories.]
Women observe subconsciously a thousand little details, without knowing they are doing so. Their subconscious mind adds these little things together - and they call the result intuition.
You travel life has the aspect of a dream. It is something outside the normal, yet you are in it. It is peopled with characters you have never seen before and in all probability will never see again. It brings occasional homesickness, and loneliness, and pangs of longing ... But you are like the Vikings who have gone into a world of adventure, and home is not home until you return.