Fortitude is the marshal of thought, the armor of the will, and the fort of reason.

But by far the greatest hindrance and aberration of the human understanding proceeds from the dullness, incompetency, and deceptions of the senses; in that things which strike the sense outweigh things which do not immediately strike it, though they be more important. Hence it is that speculation commonly ceases where sight ceases; insomuch that of things invisible there is little or no observation.

Imagination was given to man to compensate him for what he is not; a sense of humor to console him for what he is.

The cause and root of nearly all evils in the sciences is this-that while we falsely admire and extol the powers of the human mind we neglect to seek for its true helps.

States, as great engines, move slowly.

More dangers have deceived men than forced them.

Science is but an image of the truth.