The fool who knows his foolishness is wise at least to that extent; but the fool who thinks himself wise is called a fool indeed.

Understand the thought

Meaning in plain English

Recognising one’s foolishness is given a limited kind of wisdom, while mistaken self-certainty is criticised. The saying values awareness of what one does not know.

What the words are saying

At least to that extent keeps self-awareness from becoming a claim of complete understanding. A useful application identifies a specific uncertainty and seeks to learn. It does not require self-insults or presume that confidence is always unjustified.

Everyday example

Someone acknowledges not understanding a problem and asks for the evidence needed to evaluate it.

When to use it

Use it to encourage specific uncertainty and continued learning.

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Agent-assisted editorial interpretation. This explains the words; it does not by itself verify their author or earliest origin.