They condemn what they do not understand.
Friends are proved by adversity.
Everyone has the obligation to ponder well his own specific traits of character. He must also regulate them adequately and not wonder whether someone else's traits might suit him better. The more definitely his own a man's character is, the better it fits him.
The real friend is another self.
It is exercise alone that supports the spirits, and keeps the mind in vigor.
No obligation to do the impossible is binding.