Wit is folly, unless a wise man hath the keeping of it.

Understand the thought

Meaning in plain English

Cleverness needs sound judgement about how it is used. The saying distinguishes an impressive mental tool from the care required to apply it, without assigning wisdom permanently to one kind of person.

What the words are saying

Wit is something placed in a keeper’s care, as though a capable instrument could be used well or badly. The wise keeper represents consideration of purpose, consequences and the people affected. A clever remark can settle an important question, but it can also distract, wound or disguise an unsupported claim. The proverb does not make intelligence harmful in itself, nor does the label wise supply proof that a particular use is good. The useful reading examines what the cleverness achieves. It values skill guided by a worthwhile purpose rather than skill displayed simply to win attention or an argument.

Everyday example

A debater replaces a cutting joke about an opponent with a clear explanation of the actual weakness in the proposal.

When to use it

Use it when an impressive technique needs a clearer purpose or more considerate use.

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