Diane de Poitiers quotes:

Calumny is like counterfeit money; many people who would not coin it circulate it without qualms.

Courage is as often the outcome of despair as of hope; in the one case we have nothing to lose, in the other everything to gain.

It is easier to die for a cause than to live for it.

Men at any age truly never grow up. All, no matter what importance they may have attained, are still no more than little boys.

Tact is good taste in action.

We only make a dupe of the friend whose advice we ask, for we never tell him all; and it is usually what we have left unsaid that decides our conduct.

To have a good enemy, choose a friend; he knows where to strike.

The years that a woman subtracts from her age are not lost. They are added to other women's.

Old age appears hideous to us until we have to choose between it and death.

It is easier to win love than to keep it.

It is only love that has already fallen sick that is killed by absence.

... see well how it often befalls that to rise to the topmost degree would make it seem that the abyss is on high.