Virtue is the habit of acting ...

Virtue is the habit of acting according to wisdom. GOTTFRIED WILHELM LEIBNIZ, \
Virtue is the habit of acting according to wisdom. GOTTFRIED WILHELM LEIBNIZ, "Felicity", Leibniz: Political Writings Virtue is harder to be got than knowledge of the world; and, if lost in a young man, is seldom recovered. JOHN LOCKE, Some Thoughts Concerning Education However wicked men may be, they do not dare openly to appear the enemies of virtue, and when they desire to persecute her they either pretend to believe her false or attribute crimes to her.

Quotes from the same author

A true friend is the greatest of all blessings, and that which we take the least care of all to acquire.
In friendship as well as love, ignorance very often contributes more to our happiness than knowledge.
A true friend is the most precious of all possessions and the one we take the least thought about acquiring.
He is a truly virtuous man who wishes always to be open to the observation of honest men.
There are no events so disastrous that adroit men do not draw some advantage from them, nor any so fortunate that the imprudent cannot turn to their own prejudice.