The intellect, divine as it is, and all worshipful, has a habit of lodging in the most seedy of carcasses, and often, alas, acts the cannibal among the other faculties so that often, where the Mind is biggest, the Heart, the Senses, Magnanimity, Charity, Tolerance, Kindliness, and the rest of them scarcely have room to breathe.
The only possible basis for a sound morality is mutual tolerance and respect: tolerance of one another’s customs and opinions; respect for one another’s rights and feelings; awareness of one another’s needs.
We cannot learn real patience and tolerance from a guru or a friend. They can be practiced only when we come in contact with someone who creates unpleasant experiences. According to Shantideva, enemies are really good for us as we can learn a lot from them and build our inner strength.