"As in the process of his evolution he develops good qualities which can find corresponding vibrations in the matter of the causal body, the colours expressive of these qualities begin to show themselves; and presently the causal body, instead of being empty, is full of active pulsating life. So much more of the ego can now manifest through it that it has to increase enormously in size; it extends further and further from its physical centre until the man is able to enfold hundreds and even thousands of persons within himself, and so to exercise a vast influence for good... and gives us... some idea of what God means man to be."