The mind is furnished with ideas by experience alone

Neither the inveterateness of the mischief, nor the prevalency of the fashion, shall be any excuse for those who will not take care about the meaning of their own words, and will not suffer the insignificancy of their expressions to be inquired into.

To love truth for truth's sake is the principal part of human perfection in this world, and the seed-plot of all other virtues.

The only fence against the world is a thorough knowledge of it, into which a young gentleman should be enter'd by degrees, as he can bear it; and the earlier the better, so he be in safe and skillful hands to guide him.

Thirdly, the supreme power cannot take from any man any part of his property without his own consent: for the preservation of property being the end of government, and that for which men enter into society, it necessarily supposes and requires, that the people should have property, without which they must be supposed to lose that, by entering into society, which was the end for which they entered into it; too gross an absurdity for any man to own.

Mathematical proofs, like diamonds, are hard and clear, and will be touched with nothing but strict reasoning.

Firmness or stiffness of the mind is not from adherence to truth, but submission to prejudice.