Knowledge is the parent of knowledge. He who possesses most of the information of his age will not quietly submit to neglect its current acquisitions, but will go on improving as long as means and opportunities offer; while he who finds himself ignorant of most things, is only too apt to shrink from a labour which becomes Herculean.
I have never entered into any controversy in defense of my philosophical opinions; I leave them to take their chance in the world. If they are right, truth and experience will support them; if wrong, they ought to be refuted and rejected. Disputes are apt to sour one's temper and disturb one's quiet.