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In these matters the only certainty is that there is nothing certain.

Ah, what a dusty answer gets the soul when hot for certainties in this our life!

There is no such uncertainty as a sure thing.

To be absolutely certain about something, one must know everything or nothing about it.

To be positive: to be mistaken at the top of one's voice.

When I was young I was sure of everything; in a few years, having been mistaken a thousand times, I was not half so sure of most things as I was before; at present, I am hardly sure of anything but what God has revealed to me.

If we begin with certainties, we shall end in doubts; but if we begin with doubts, and are patient in them, we shall end in certainties.

Convictions are more dangerous foes of truth than lies.