"The human understanding is unquiet; it cannot stop or rest, and still presses onward, but in vain."

"The mind of man is subject to three diseases; namely, to be too credulous, to be too incredulous, or to be too curious."

"The subtlety of nature is greater many times over than the subtlety of the senses and understanding."

"I have taken all knowledge to be my province."

"For the mind, when it is once possessed with an opinion, draws all things else to confirm and agree with it."