The command, that we should love our neighbor as ourselves, evidently implies, that the love of ourselves, in the sense of seeking our own happiness so far as is consistent with the happiness and rights of others, is admissible. Hence men are properly directed and encouraged to seek their own happiness. It is proper even to direct and encourage them to seek religion for the sake, (not for the exclusive sake, but still for the sake,) of their own happiness. In seeking religion, in other words, in seeking the restoration of the mind to God, there can be no doubt, that one legitimate motive may be the desire of our own highest good. It is certain that this is one of the motives, calculated ultimately to lead men in a religious course, which is not unfrequently addressed to them in the Holy Scriptures. "There is not," says Dr. Wardlaw, "any part of the Divine Word, by which we are required, in any circumstances, to divest ourselves of this essential principle in our constitution. That Word, on the contrary, is full of appeals to it, under every diversity of form. Such are all its threatenings, all its promises, all its invitations."
— edited from The Interior or Hidden Life (1844) Part 2, Chapter 5.