41.One false move may lose the game.
42.One good turn deserves another.
43.One hour today is worth two tomorrow.
44.One man's fault is other man's lesson.
45.One never loses anything by politeness.
46.One swallow does not make a summer.
47.One's words reflect one's thinking.
48.Out of debt, out of danger.
49.Out of office, out of danger.
50.Out of sight, out of mind.