Virtue has a veil, vice a mask.

Whatever causes night in our souls may leave stars. Cimourdain was full of virtues and truth, but they shine out of a dark background.

Peace is the virtue of civilization. War is its crime.

Virtue practiced to be seen is not real virtue; vice which fears to be seen is real vice

Virtue by calculation is the virtue of vice

Though ambition in itself is a vice, it often is also the parent of virtue.