I perceive, by your letter, you are in doubt about the grace which passes interiorly from heart to heart. We notice an illustration of this in the woman who touched our Lord, when he said: “I perceive that virtue is gone out of me.” In a similar manner, without words, one heart may communicate grace to another heart, as God imparts grace to the soul. But if the soul is not in a state to receive it, the grace of the interior is not communicated, as is expressed in another passage; “If they are not children of peace, your peace will return to you again.” This illustrates, according to my view, pure interior communications of the grace of God, from heart to heart, which the soul relishes in silence, and which silence is often more efficacious than a multitude of words.
God would teach you... there is a silence of the soul through which he operates, filling it with the unction of grace, to be diffused on other hearts who are in a state of receptivity, often more efficacious than words to replenish the soul.
We find this still, harmonious action in nature. The sun, the moon, and stars, shine in silence. The voice of God is heard in the silence of the soul. The operation of grace is in silence, as it comes from God, and may it not reach and pass from soul to soul without the noise of words? O, that all Christians knew what it means to keep silence before the Lord.
Selected from Madame Guyon’s Spiritual Letters, pp. 59, 60