Be all things to all people. Be a discreet Proteus, learned with the learned, saintly with the sainted. It is the great art to garin everyone's support; general agreement gains goodwill. Notice people's moods and adapt yourself to each, genial or serious as the case may be. Follow their lead, glossing over the changes as cunningly as possible. This is an especially indispensable art for people who are dependent on others. But this skill in the art of living calls for great cleverness. He only will find no difficulty who has a universal genius in his knowledge and universal ingenuity in his wit.

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