No doubt simple things to human beings are too simple; too many people who have studied think that they must no longer learn anything. It is too easy; yet if they would study it closely they would see it is the most difficult thing in the world. The necessity of life is a spiritual necessity from a metaphysical point of view. In other words brotherhood is the nature of man, and the secret of brotherhood is centered in the idea that like attracts like. Some animals go in numbers; they are attached to each other, and they abide in harmony.