Jonathan Edwards
We have no strict demonstration of anything, except mathematical truths, but by metaphysics. We can have no proof that is properly demonstrative, of any one position relating to the being and nature of God, his creation of the world, the dependence of all things on him, the nature of bodies and spirits, the nature of our own souls, or any of the great truths of morality and natural religion, but what is metaphysical.
Jonathan Edwards