The saints speak of something they call the inextinguishable light. It is a light not of the eye but of the heart that never ceases to walk in purity and clearness. It swiftly leaves the darkness behind, and constantly strives towards the day's height. Its constant quality is to be continually purified. This is the light of eternity that can never go out, and that shines through the veil of time and matter. The saints never say that this light is given to them, but that it is given only to those who have purified their hearts in love for the Lord, on the narrow way which they have freely chosen.
In that nocturnal tranquility and silence and in knowledge of the divine light, the soul becomes aware of Wisdom's wonderful harmony and sequence in the variety of her creatures and works. Each of them is endowed wíth a certain likeness of God and in its own way gives voice to what of God is in it. So creatures will be for the soul a harmonious symphony of sublime music surpassing all concerts and melodies of the world. Thus there ís in it the sweetness of music and the quietude of silence. AccordÍngly, she says that her Beloved is silent music because in the Beloved she knows and enjoys this symphony of spiritual music.