Quotes About Certainty

You can't know, you can only believe - or not.

The confidence of ignorance will always overcome the indecision of knowledge.

Knowledge is invariably a matter of degree: you cannot put your finger upon even the simplest datum and say this we know.

They knew many things but had no idea why. And strangely this made them more, rather than less, certain that they were right.

When general observations are drawn from so many particulars as to become certain and indisputable, these are jewels of knowledge.

Wir mussen wissen. Wir werden wissen. We must know. We will know. Inscribed on his tomb in Gilttingen.

Be patient and live with the knowledge that all you are searching for is certain to come if you prepare for it and expect it.

We are least open to precise knowledge concerning the things we are most vehement about.

I don't believe. I know.

Speculation is not knowledge.

One of the best ways of repressing emotions is artificial certainty.

As knowledge increases, the verdict of yesterday must be reversed today, and in the long run the most positive authority is the least to be trusted.

You don't need absolute knowledge to have reliable knowledge

Knowledge breeds doubt, not certainty, And the more we know the more uncertain we become.

All knowledge, we feel, must be built up upon our instinctive beliefs; and if these are rejected, nothing is left.

Everybody liked better to conjecture how the thing was, than simply to know it; for conjecture soon became more confident than knowledge, and had a more liberal allowance for the incompatible.

Knowledge, absolutely sure of its infallibility, is faith.

Not if I know myself at all.

Rational confidence [is] the just result of knowledge and experience.

... I distrust manifest knowledge.

Whether you know the shape of a pebble or the structure of a solar system, the anxioms remain the same: that it exists and that you know it.

I do not pretend to know what many ignorant men are sure of.

Knowing isn't always believing.

Because there is a word for perfection, people will always imagine that they know it.