Do not give way to every common impulse. He is great who never allows himself to be influenced by the impressions of others. Self-reflection is the school of wisdom; to know one's current disposition and to allow for it, even going to the other extreme so as to find a balance between nature and art. Self-knowledge is the beginning of self-improvement. There are some whose humors are so monstrous that they are always under the influence of one or other of them and put them in place of real inclinations. They are torn asunder by such disharmony and get involved in contradictory obligations. Such excesses not only destroy firmness of will, all power of judgment gets lost and desire and knowledge pull in opposite directions.

THE ART OF WORLDLY WISDOM BY BALTHASAR GRACIAN
TRANSLATED BY JOSEPH JACOBS 1892