If anyone thinks he is religious
and does not bridle his tongue but deceives his heart,
his religion is vain.

James 1, 26

St. Sister Faustina about silence

(Selected parts of the Diary of St. Faustina Kowalska)

Silence is a sword in the spiritual struggle. A talkative soul will never attain sanctity. The sword of silence will cut off everything that would like to cling to the soul. We are sensitive to words and quickly want to answer back, without taking any regard as to whether it is God‟s will that we should speak. A silent soul is strong; no adversities will harm it if it perseveres in silence. The silent soul is capable of attaining the closest union with God. It lives almost always under the inspiration of the Holy Spirit. God works in a silent soul without hindrance (Diary 477).

Silence is so powerful a language that it reaches the throne of the living God. Silence is His language, though secret, yet living and powerful (Diary 888).

But, in order to hear the voice of God, one has to have silence in one's soul and to keep silence; not a gloomy silence, but an interior silence; that is to say, recollection in god. One can speak a great deal without breaking silence and, on the contrary, one can speak little and be constantly breaking silence. Oh, what irreparable damage is done by the breach of silence! We cause a lot of harm to our neighbor, but even more to our own selves (Diary 118).  

God does not give Himself to a chattering soul which, like a drone in a beehive, buzzes around but gathers no honey. A talkative soul is empty inside. It lacks both the essential virtues and intimacy with God. A deeper interior life, one of gentle peace and of that silence where the Lord dwells, is quite out of the question. A soul that has never tasted the sweetness of inner silence is a restless spirit which disturbs the silence of others (Diary 118). But for the Spirit of God to act in the soul, peace and recollection are needed (Diary 145).

Patience, prayer and silence – these are what give strength to the soul (Diary 944).