Silence gives consent

Silence gives consent.

Prov. If you do not object to what someone says or does, you can be assumed to agree with or condone it. Jill: What did Fred say when you told him we were thinking about leaving the office early? Jane: He didn't say anything. Jill: Then he must not mind if we go. Silence gives consent.
See also: consent, give, silence
References in classic literature ?
The steward was about to act on the old principle, that silence gives consent, when Hiram Doolittle, attended by Jotham, stalked out of the crowd, across the open space, and approached the stocks.
To be sure I must; and therefore I may assume that your silence gives consent.
C* Said Plato " I shall assume that your silence gives consent.