The manner in which he conveyed his wisdom to the ordinary mind also brought him near to common human nature and ingratiated him with it. He not only knew what human ignorance and weakness were; he not only never looked haughtily and superciliously down on them; but he respected them and addressed them with sympathy. His scientific writings were wonders of clearness and simplicity. There was in them nothing of that affectation of scientific mysteriousness indulged in by many who try to appear profound by being unintelligible. He made philosophy and science the plain, sensible, familiar friend and fireside companion of everybody's life. The initiated reader of his scientific writings is constantly astonished and delighted to find how simple it all is. He never thought of oppressing any one with demonstrations of mental superiority. On the contrary, it was his constant endeavor so to infuse his thoughts into his hearers, as to make them feel that those thoughts were really their own.
This was with him not only a matter of instinct but a well cultivated habit.
I made it a rule [he says in his autobiography] to forbear all direct contradiction to the sentiments of others and all positive assertion of my own. I even forbid myself the use of every word or expression that imported a fixed opinion, such as certainly, undoubtedly, etc., and I adopted instead of them I conceive, I apprehend or I imagine a thing to be so and so. When another asserted anything that I thought an error, I denied myself the pleasure of contradicting him abruptly; and in answering I began by observing that in certain circumstances his opinion might be right, but in the present case there appeared to be some difference, etc. The modest way in which I proposed my opinions procured them a readier reception and less contradiction. To this habit (after my character for integrity) I think it principally owing that I had early so much weight with my fellow-citizens when
