Who are these guardians? They are those whom we call the elder brothers of the human race, and are men in all senses of the word and not excarnate sp… - Gottfried de Purucker

Reincarnation comes under the more general doctrine of reimbodiment. It is the teaching that the human ego returns to earth at some future time after the change men call death... in order that the ego may learn new lessons on earth, in new times, in new environments; taking up again on this earth the old links of sympathy and of friendship, of hatred and dislike, which were apparently ruptured by the hand of death when the ego-soul left our spheres. (Chapter 2)

You cannot express universal powers, you cannot manifest the divinity within you (because that divinity is entirely impersonal) if your mind and heart are restricted and imprisoned by your personal desires. You must expand your nature and open it in order to let the sunlight of the spirit stream in to you. Therefore self-forgetfulness and impersonality mean the gaining of wisdom and great and holy power. (Chapter 3)

It is a question of relativity. In order to understand it more clearly we must cleanse our minds of old ideas instilled into us by false education, both religious and scientific, and philosophic too (Ch 2)