Obsession is the single most wasteful human activity, because with an obsession you keep coming back and back and back to the same question and never get an answer. ↗
Consequently he who wishes to attain to human perfection, must therefore first study Logic, next the various branches of Mathematics in their proper order, then Physics, and lastly Metaphysics. ↗
In a state therefore of great equality and virtue, where pure and simple manners prevailed, the increase of the human species would evidently be much greater than any increase that has been hitherto known. ↗