The light dove, cleaving the air in her free flight, and feeling its resistance, might imagine that its flight would be still easier in empty space. - Immanuel Kant

All trades, arts, and handiwork have gained by division of labor, namely, when, instead of one man doing everything, each confines himself to a certain kind of work distinct from others in the treatment it requires, so as to be able to perform it with greater facility and in the greatest perfection.

Nature has willed that man should, by himself, produce everything that goes beyond the mechanical ordering of his animal existence, and that he should partake of no other happiness or perfection than that which he himself, independently of instinct, has created by his own reason.

We can indeed recognize a tremendous difference in manner, but not in principle, between a shaman of the Tunguses and a European prelate: … for, as regards principle, they both belong to one and the same class, namely, the class of those who let their worship of God consist in what in itself can never make man better (in faith in certain statutory dogmas or celebration of certain arbitrary observances). Only those who mean to find the service of God solely in the disposition to good life-conduct distinguish themselves from those others, by virtue of having passed over to a wholly different principle.