Scientific knowledge advances haltingly and is stimulated by contention and doubt.

Religious moderation is the product of secular knowledge and scriptural ignorance.

Atheism is the opium of the mathematicians. Atheism is the religion of Mathematics.

The essence of the independent mind lies not in what it thinks, but in how it thinks.

I'd rather be encouraged by an ant to live than taught to doubt by fifty skeptics.

In a post-Christian, skeptical age, love on display is the most convincing apologetic.

I don’t believe in astrology; I’m a Sagittarius and we’re skeptical.

It's not true that skeptics consider nothing sacred. They consider freedom sacred.

. . . I don’t believe that celebrity spokeswomen get their hair colour from a box.

It's a most distressing affliction to have a sentimental heart and a skeptical mind.

I am not accustomed to saying anything with certainty after only one or two observations.

Skepticism relieved two terrible diseases that afflicted mankind: anxiety and dogmatism.

Skepticism is healthy in matters of the intellect, but disastrous in matters of the heart.

Simply to acquiesce in skepticism can never suffice to overcome the restlessness of reason.

The justifications of men who kill should always be heard with skepticism, said the monster.