It puts before him, as far as he can at present know them, the facts about God and man and the relations between them; then he proceeds to take these facts into account and to act in relation to them with ordinary reason and common sense.

He regulates his life according to the laws of evolution which it has taught him, and this gives him a totally different standpoint, and a touchstone by which to try everything--his own thoughts and feelings, and his own actions first of all, and then those things which come before him in the world outside himself.
Always he applies this criterion: Is the thing right or wrong, does it help evolution or does it hinder it?
If a thought or a feeling arises within himself, he sees at once by this test whether it is one he ought to encourage.

If it be for the greatest good of the greatest number then all is well; if it may hinder or cause harm to any being in its progress, then it is evil and to be avoided.

Exactly the same reason holds good if he is called upon to decide with regard to anything outside himself.

If from that point of view a thing be a good thing, then he can conscientiously support it; if not, then it is not for him.
For him the question of personal interest does not come into the case at all.