Friendship

Whoever is sitting together with friends even if he is as in a furnace, he is as in the midst of a beautiful garden.
But whoever is seated with an enemy, due to bad fortune, even if he is in a garden, he is in a furnace. 
Don't torment your friend by means of your egotism, so that your friend doesn't become your enemy and opponent.
Do good deeds for the people for the sake of your God at least for the sake of the peace of your soul, 
So that you may always see them as friendly in your sight and so that unpleasant forms of thought due to hatred will not appear in your heart.

The Masnawi, Volume IV, 1976-80