Send a wise man on an errand and say nothing to him.

Understand the thought

Meaning in plain English

A capable person can exercise judgement without being told every step. The saying values competent discretion, but silence is not a substitute for explaining the purpose, essential constraints or information that the person cannot otherwise know.

What the words are saying

The wise messenger in the proverb is trusted to adapt to the errand rather than follow a script for every possible encounter. Figuratively, competence gives someone room to choose an appropriate method and respond to circumstances. That freedom can be useful when detailed instructions would restrict good judgement. Yet the errand still needs an understood destination and purpose. A person cannot reliably infer undisclosed requirements merely because they are capable. The phrase say nothing therefore works as rhetorical praise for discretion, not as a complete method of briefing someone. A useful reading combines clear objectives with freedom over the details that do not need to be prescribed.

Everyday example

A librarian tells an experienced colleague which documents a visitor needs and leaves the colleague to choose the best route through the catalogue.

When to use it

Use it when a competent person needs discretion rather than instructions for every minor step.

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