In this stage the spirit, having learnt perfectly how to receive impression through matter and how to express itself through it, and having awakened its dormant powers, learns to use these powers rightly in the service of the Deity.
The object of the whole previous evolution has been to produce the ego as a manifestation of the Monad.

Then the ego in its turn evolves by putting itself down into a succession of personalities.

Men who do not understand this look upon the personality as the self, and consequently live for it alone, and try to regulate their lives for what appears to be its temporary advantage.

The man who understands realizes that the only important thing is the life of the ego, and that its progress is the object for which the temporary personality must be used.

Therefore when he has to decide between two possible courses he thinks not, as the ordinary man might: "Which will bring the greater pleasure and profit to me as a personality ?" but "Which will bring greater progress to me as an ego ?" Experience soon teaches him that nothing can ever be really good for him, or for anyone, which is not good for all, and so presently he learns to forget himself altogether, and to ask only what will be best for humanity as a whole.
Clearly then at this stage of evolution whatever tends to unity, whatever tends to spirituality, is in accord with the plan of the Deity for us, and is therefore right for us, while whatever tends to separateness or to materiality is equally certainly wrong for us.