Those who remain silent are responsible.
Saint Teresa Benedicta of the Cross

What does this quote mean? In English, there’s a twofold possibility:

• Those who remain silent about their own goodness act responsibly.
• Those who remain silent about evil in the world share in culpability.

It is, in the original, the latter which is meant: Those who remain silent about evil in the world share in culpability. 

Contemplation only means certain kinds of silence. Contemplation is totally incompatible with silence in the face of injustice, oppression, racial prejudice, economic injustice, or any form of social evil.