Do you agree? It's a difficult question.
"We are all the same people as we were at three, six, ten or twenty years old. More noticeably so, perhaps, at six or seven, because we were not pretending so much then, whereas at twenty we put on a show of being someone else, of being in the mode of the moment. If there is an intellectual fashion, you become an intellectual--if girls are fluffy and frivolous, you are fluffy and frivolous. As life goes on, however, it becomes tiring to keep up the character you invented for yourself, and so you relapse into individuality and become more like yourself every day. This is sometimes disconcerting for those around you, but a great relief to the person concerned."
--Agatha Christie, An Autobiography
Self-knowledge! In the end, any discussion of happiness always returns to the question of self-knowledge.
Relatedly, what's your favorite Agatha Christie mystery? I don't read mysteries, but I loved her autobiography, so want to try the mysteries. She wrote sixty-eight novels, where to start!