“A soul shows the proof of its evolution in the degree of the tolerance it shows. The life in the lower creation shows the lack of tolerance. The tendency of fighting with one another, which one sees among beasts and birds, shows the reason at the back of it, that intolerance is born in their nature. … But when a soul has evolved still more, tolerance becomes the natural thing for him. Because the highly evolved soul then begins to realize ‘Another person is not separate from me, but the other person is myself. The separation is on the surface of life, but in the depth of life I and the other person are one.’ Therefore tolerance is not learned fully by trying to follow it as a good principle. It is learned by having the love of God, by attaining the knowledge of self, and by understanding the truth of life.”
~ Hazrat Inayat Khan (via Wahiduddin)
