Before impugning an opponent's motives, even when they legitimately may be impugned, answer his arguments.
To deny me the right to err is therefore to deny me the right to believe.
To silence criticism is to silence freedom.
No one who accepts the sovereignty of truth can be a foot soldier in a party or movement. He will always find himself out of step.
[A]nti-Semitism was rife in almost all varieties of socialism.
Religious tolerance has developed more as a consequence of the impotence of religions to impose their dogmas on each other than as a consequence of spiritual humility in the quest for understanding first and last things.