Skepticism is the highest duty and blind faith the one unpardonable sin.
. . . I fail to find a trace [in Protestantism] of any desire to set reason free. The most that can be discovered is a proposal to change masters. From being a slave of the papacy, the intellect was to become the serf of the Bible.
Agnosticism simply means that a man shall not say that he knows or believes that for which he has no grounds for professing to believe.
I would rather be the offspring of two apes than be a man and afraid to face the truth.
It ought not to be unpleasant to say that which one honestly believes or disbelieves. That it so constantly is painful to do so, is quite enough obstacle to the progress of mankind in that most valuable of all qualities, honesty of word or of deed.
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