I have learned two important things in life. I don't remember the first one, but the second one is write everything down.
Any coward can fight a battle when he's sure of winning, but give me the man who has pluck to fight when he's sure of losing. That's my way, sir; and there are many victories worse than a defeat. -George Eliot
It is impossible to make anything foolproof because fools are too ingenious.