There is no 'one-size-fits-all' way to build an audience.

It is questionable if all the mechanical inventions yet made have lightened the day's toil of any human being.

The price paid for intellectual pacification is the sacrifice of the entire moral courage of the human mind.

One person with a belief is equal to ninety-nine who have only interests.

If religious belief be indeed so necessary to mankind, as we are continually assured that it is, there is great reason to lament, that the intellectual grounds of it should require to be backed by moral bribery or subornation of the understanding.

Truth emerges from the clash of adverse ideas.

It is not the feeling sure of a doctrine (be it what it may) which I call an assumption of infallibility. It is the undertaking to decide that question for others, without allowing them to hear what can be said on the contrary side. And I denounce and reprobate this pretension not the less, if put forth on the side of my most solemn convictions.