"Silence does not always mark wisdom"

This quote highlights the suggestion that even if somebody is silent, it does not always suggest they have wisdom. Coleridge is warning versus presuming that somebody is wise merely because they do not talk, as this can result in overlooking people who do have useful understandings to share.

The quote recommends that knowledge is not solely depending on words, but also consists of the capacity to view, mirror and act appropriately. The silence of a person may suggest a lack of knowledge on a specific topic or an unwillingness to share their ideas.

Generally, the message of the quote is to avoid making assumptions about others based entirely on their activities or lack thereof, and to be open to listening and also thinking about the suggestions of others.