When is it time to return to selfless silence?

Answer 1

Selfless, meaning putting other's needs first.
Silence, meaning a refusal, failure, or inability to speak.

So when should we close our mouths and just do for others? As often as we can of course, that is the way we show love. For indeed love is an ACT, it is something you do for someone, not just something you feel.

Answer 2

Not now. The command has gone forth to spread the word. So to revise your question, now is the time to go forth in selfless speech!