It follows from the supreme perfection of God, that in creating the universe he has chosen the best possible plan in producing the universe, a plan in which there is the greatest variety together with the greatest order ...The most carefully used plot of land, place and time, the greatest effect produced by the simplest means; the most power, knowledge happiness and goodness in created things that the universe could allow. For as all possible things have a claim to existence in the understanding of God in proportion to their perfections, the result of all these claims must be the most perfect actual world which is possible. Otherwise it would not be possible to explain why things have happened as they have rather than otherwise..."
From Principles of Nature and Grace, based on Reason. (1714)