For to pretend that their significance is universally familiar and that everyone indeed possesses their concept, rather looks like an attempt to dispense with the only important matter, which is just to give this concept With better right, on the contrary, we might spare ourselves the trouble of taking any notice at all of such ideas and ways of talking which would have the effect of warding off science altogether; for they make a mere empty show of knowledge which at once vanishes when science comes on the scene.