When the monk cleans the senses in stillness, the mind becomes peaceful and the heart is cleansed, and he receives grace and the light of knowledge. … - Joseph the Hesychast

When grace comes, all the schemes of the evil one cease, for it abolishes them. It comes like a gentle breeze, like a subtle, fragrant zephyr which deadens the flesh and then raises the soul. It enlightens our nous. And in the end, when it comes, grace itself teaches a person.

So when grace abounds in a person and he knows all that we have written, he attains great simplicity; his nous expands and has great capacity. Just as you tasted that drop of grace when much joy and exultation came upon you, it comes again in the same manner when the nous remains in prayer. But much more comes, like a subtle breeze, like a mighty gust of fragrant wind. It overflows throughout the body, and the prayer stops; the bodily members cease to move, and only the nous is in theoria within an extraordinary light. A union of God and man occurs. Man is unable to distinguish himself. It is just like iron: before it is thrown into the fire it is called iron, but once it ignites and becomes red-hot, it is one with the fire. It is also like wax which melts when it approaches fire; it cannot remain in its natural state.

Illumination is followed by interruptions in the prayer and frequent theorias, rapture of the nous, cessation of the senses, stillness, profound silence of the bodily members, and union of God and man into one. This is the divine exchange in which, if one endures temptations and does not stop struggling along the way, one exchanges the material for the immaterial….