If I were travelling with two partners, one virtuous and one dishonest, both would be useful as teachers. I would perceive what's good of the first one and I would imitate him whereas I would try to correct in me the defects I may see in the second one.
ConfuciusThere are three things against which the wise man guards: lust when young, quarrels when strong, and covetousness when old.
Confucius