A strong conviction that something must be done is the parent of many bad measures.

The compensation of a very early success is a conviction that life is a romantic matter. In the best sense one stays young.

I have brought myself, by long meditation, to the conviction that a human being with settled purpose must accomplish it, and that nothing can resist a will which will stake even existence upon its fulfillment.

In the age-old contest between popularity and principle, only those willing to lose for their convictions are deserving of posterity’s approval.

The deepest thing in any one is the conviction of the bad luck that follows boasting.

An irresistible passion that would induce me to believe in innate ideas and the truth of prophecy has decided my career. I have always loved liberty with the enthusiasm which actuates the religious man with the passion of a lover and with the conviction of a geometrician.

The secret of success is conviction and persistence.

What we obtain too cheap, we esteem too lightly: it is dearness only that gives every thing its value. Heaven knows how to put a proper price upon its goods; and it would be strange indeed if so celestial an article as freedom should not be highly rated.

That deep emotional conviction of the presence of a superior reasoning power, which is revealed in the incomprehensible universe, forms my idea of God.

When the intensity of emotional conviction subsides, a man who is in the habit of reasoning will search for logical grounds in favor of the belief which he finds in himself.