The less one, as a result of objective or subjective conditions, has to come into contact with people, the better off one is for it. - Arthur Schopenhauer

The only certain rule is the one that Aristotle already gave: do not dispute with anyone and everyone, but only with those people you know who are intelligent enough to avoid saying things that are so stupid as to expose themselves to humiliation, who appreciate the truth, and who gladly listen to good reasons, even when the opponent claims them, and who are balanced enough to bear a defeat when the truth is on the other side.

Sociability belongs to the most dangerous, even destructive inclinations, since it brings us into contact with beings the great majority of whom are morally bad and intellectually dull or perverted.

For the world is Hell, and men are on the one hand the tormented souls and on the other the devils in it.