the work is dry, obscure, opposed to all ordinary notions, and moreover long-winded. - Immanuel Kant

He who would know the world must first manufacture it.

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.

Denken zonder ervaring is leeg, maar ervaring zonder denken is blind.