"The greatest deception men suffer is from their own opinions."

"Iron rusts from disuse; stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigor of the mind."

"He who does not punish evil commands it to be done."

"men who desire nothing but material riches and are absolutely devoid of the desire for wisdom, which is the sustenance and truly dependable wealth of the mind."

"Nothing can be loved or hated unless it is first known."

"The desire to know is natural to good men."

"As every divided kingdom falls, so every mind divided between many studies confounds and saps itself."

"Intellectual passion drives out sensuality."

"The truth of things is the chief nutriment of superior intellects."

"The deeper the feeling, the greater the pain."

"I have offended God and mankind because my work did not reach the quality it should have."