“Those who never retract their opinions love themselves more than they love truth.”

“Truth gains more even by the errors of one who, with due study and preparation, thinks for himself, than by the true opinions of those who only hold them because they do not suffer themselves to think…”

“Goodness is more difficult than evil. Evil men knew that more than good men. That's why they became evil. That's why it stuck with them. Evil was for those who could never reach the truth. It was a mask for stupidity and lack of love.”

“The peculiar evil of silencing the expression of an opinion is, that it is robbing the human race; posterity as well as the existing generation; those who dissent from the opinion, still more than those who hold it. If the opinion is right, they are deprived of the opportunity of exchanging error for truth: if wrong, they lose, what is almost as great a benefit, the clearer perception and livelier impression of truth, produced by its collision with error.”

“Let those love now, who never lov'd before, / Let those who always lov'd, now love the more.”

“He who begins by loving Christianity more than Truth, will proceed by loving his sect or church better than Christianity, and end in loving himself better than all.”