Caution is fear on tiptoe.

Caution is wise — A cautious man is worth two.

Caution is not likely to lead to success — A castle is not overthrown by precaution.

Caution is the parent of safety.

Diplomacy is lying in state.

Diplomacy is doing just what you said you wouldn't.

Diplomacy is the art of winning without having the other guy lose.

Diplomacy is to do and say The nastiest things in the nicest way.

Discipline is necessary for man, for he is by nature raw and wild.

Discipline is the soul of an army. It makes small numbers formidable; procures success to the weak and esteem to all.

Discipline is choosing between what you want now and what you want most.

Discipline is often praised by some folk, but nine times out of ten, this means they are prepared to administer it rather than submit to it.

Discretion is wise — knowing what to say helps a little; knowing what not to say helps more.

Discretion is more than eloquence

Discretion is that honorable stop.

Discretion is a wise course — a bridle for the tongue is a necessary piece of furniture.