Rambam, Guide for the Perplexed 3:27

The law as a whole aims at two things: the welfare of the soul and the welfare of the body. As for the welfare of the soul, it consists in the multitude’s acquiring correct opinions corresponding to their respective capacity…The true Law then, which as we have already made clear is unique—namely, the Law of Moses our Master—has come to bring us both perfections, I mean the welfare of the states of people in their relations with one another through the abolition of reciprocal wrongdoing and through the acquisition of a noble and excellent character. In this way the perseveration of the population of the country and their permanent existence in the same order become possible, so that every one of them achieves his first perfection; I mean also the soundness of the beliefs and the giving of correct opinions through which ultimate perfection is achieved. The Torah speaks of both perfections and informs us that the end of this Law in its entirety is the achievement of these two perfections. [Translation by Uri L'Tzedek]