You can have such an open mind that it is too porous to hold a conviction.

Nothing is more depressing than the conviction that one is not a hero.

Conviction is the conscience of the mind.

Conviction is the conscience of the mind.

I have the conviction that excessive literary production is a social offense

The great safeguard of society and of domestic life was, that opinions were not acted on. Sane people did what their neighbors did, so that if any lunatics were at large, one might know and avoid them.