Knowledge is two-fold, and consists not only in an affirmation of what is true, but in the negation of that which is false.
A harmless hilarity and a buoyant cheerfulness are not infrequent concomitants of genius; and we are never more deceived than when we mistake gravity for greatness, solemnity for science, and pomposity for erudition.
In science, reason is the guide; in poetry, taste. The object of the one is truth, which is uniform and indivisible; the object of the other is beauty, which is multiform and varied.
Professors in every branch of the sciences, prefer their own theories to truth: the reason is that their theories are private property, but truth is common stock.
It is not so difficult a task as to plant new truths, as to root out old errors
No disorders have employed so many quacks, as those that have no cure; and no sciences have exercised so many quills, as those that have no certainty.
The acquirements of science may be termed the armour of the mind; but that armour would be worse than useless, that cost us all we had, and left us nothing to defend.
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