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.
It is easier to die for a cause than to live for it.
It is only love that has already fallen sick that is killed by absence.
To have a good enemy, choose a friend; he knows where to strike.
... see well how it often befalls that to rise to the topmost degree would make it seem that the abyss is on high.