Take great care to restrain your tongue and be circumspect. Let only discretion and charity open your mouth. And practice the advice of all the Saints to break silence only with words that are worth more than silence. Silence is one of the most certain signs that God dwells in a soul.
Silence in mercy means more than stilling our tongues whenever we plan to speak unkindly. We must silence our judgmental thoughts as well. Each time we think of another person critically, we need to consciously isolate that thought and replace it with one that is imbued with gracious tolerance for his or her faults ... In such silence, we allow others to exist as God made them to be rather than how we would wish them to be ... Through the use of silence, we not only drive out our desire to dominate and control, but also learn to listen to one another. When we truly hear what others are saying to us in the respectful silence of our heart, we can begin to serve others with mercy, for we now know what they need from us and can respond accordingly.