All are not hunters that blow the horn.

Visible signs associated with a trade, role, or accomplishment do not prove that a person genuinely belongs to that group. Someone may copy its outward signals without possessing its knowledge, authority, or ability.

The saying advises judging people by more than display, costume, language, or ceremonial behavior. It warns that public claims and impressive appearances can mislead, so competence and character should be assessed by stronger evidence rather than assumptions about a group.

Use it when someone is mistaken for an expert or authentic participant merely because they adopt recognizable trappings. The wording may sound archaic in ordinary contemporary conversation, so its point can be restated more directly when needed.