Doubt is not a pleasant mental state, but certainty is a ridiculous one.

Doubt is not a pleasant condition, but certainty is absurd

The human spirit glows from that small inner light of doubt whether we are right, while those who believe with certainty that they possess the right are dark inside and darken the world outside with cruelty, pain, and injustice.

Doubt cannot override a certainty

If we do not find anything very pleasant, at least we shall find something new.

Doubt is uncomfortable, certainty is ridiculous.