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- Carry on any enterprise as if all future success depends on it.
- I have never had any [enemies] other than those of the state.
- I have the consolation of leaving your kingdom in the highest degree of glory and of reputation.
- Written to Louis XIII just days before he died.
- Never write a letter and never destroy one.
- One must believe neither the people of the palace, who ordinarily measure the power of the king by the shape of his crown, which, being round, has no end, nor those who, in the excesses of an indiscreet zeal, proclaim themselves openly as partisans of Rome.
- Reason must be the universal rule and guide; all things must be done according to reason without allowing oneself to be swayed by emotion.
- War is one of the scourges with which it has pleased God to afflict men.
- Who commits treason is only matter of the date. (actual source: Tallyrand)