A still tongue makes a wise head

This page is about the saying "A still tongue makes a wise head"

Possible meaning:
Someone who does not talk much, but listens to other people, probably has experience, knowledge and good judgement.

Note:
still (adj.): not moving | tongue (noun): large, movable fleshy part in the mouth that we use for talking and tasting | wise (adj.): having experience, knowledge and good judgement