The standard is God's will, not man's immediate happiness.

And yet to this will, as soon as, by natural or supernatural means, we discern it, the Godlike part of our nature at once responds: it at once acknowledges it as eternal and divine, although we can give no logical reasons for such acknowledgment.
By the light, too, of these same beliefs, the inwardness of the moral end assumes an explicable meaning.

Man's primary duty is towards God; his secondary duty is towards his brother men; and it is only from the filial relation that the fraternal springs.

The moral end, then, is so precious in the eyes of the theist, because the inward state that it consists of is agreeable to what God wills--a God who reads the heart, and who cannot be deceived.

And the theist's peace or gladness in his highest moral actions springs not so much from the consciousness of what he does or is, as of the reasons why he does or is it--reasons that reach far away beyond the earth and its destinies, and connect him with some timeless and holy mystery.
Thus theism, whether it be true or no, can give a logical and a full account of the supposed nature of the moral end, and of its supposed importance.