Natural Law without God

If we could abandon, for a moment, every theistical idea, it would nevertheless remain substantially true, that the happiness of society must depend upon the exercise of equal and reciprocal justice. It would also be true, that benevolence is an amiable trait in the character of man; that the cultivation of his faculties is a duty imposed on him, because the faithful performance of his duty extends the circle of his real felicity; that vice is the bane of individual and social existence; that truth is to be preferred to falsehood, activity to indolence, temperance to debauchery, and, generally, that science and virtue claim pre-eminently over ignorance and vice, the universal attachment of the human race. All these, and many other particulars of a like nature, would stand as immortal monuments of the real nature of moral principles, even after cultivated intellect shall have performed the last solemn act of duty relative to the ancient regimen, and shall have recalled bewildered man to the happy contemplation of the laws and immutable energies of the physical universe.

--Elihu Palmer (1764-1806), Principles of Nature; or, A Development of 
the Moral Causes of Happiness and Misery Among the Human Species