The mind is furnished with ideas by experience alone

There is no such way to gain admittance, or give defence to strange and absurd Doctrines, as to guard them round about with Legions of obscure, doubtful, and undefin'd Words.

Try all things, hold fast that which is good.

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

For it will be very difficult to persuade men of sense that he who with dry eyes and satisfaction of mind can deliver his brother to the executioner to be burnt alive, does sincerely and heartily concern himself to save that brother from the flames of hell in the world to come.

So difficult it is to show the various meanings and imperfections of words when we have nothing else but words to do it with.

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.