[U]niversities... have gradually allowed to fall into disuse the powerful means which they possess of rousing the pupil to exertion, and have been to… - Sir William Hamilton, 9th Baronet

Scotus... declares that a man’s knowledge is measured by the amount of his mental activity...

[T]he sciences always studied with keenest interest are those in a state of progress and uncertainty: absolute certainty and absolute completion would be the paralysis of any study; and the last worst calamity that could befall man... would be that full and final possession of speculative truth, which he now vainly anticipates as the consummation of his intellectual happiness.

The intellect," says Aristotle... "is perfected, not by knowledge but by activity..." and... "The arts and sciences are powers, but every power exists only for the sake of action; the end of philosophy... is not knowledge, but the energy conversant about knowledge.