All thinking enters the heart through a certain meaningful representation. But it is only then that the blessed light of divinity shines upon it when it has withdrawn from all things and no longer has any imagery. The radiance of the divine light reveals itself to the pure spirit through the absence of all thoughts...
Therefore, it is important that the one praying keeps himself away from all thoughts that impress the spirit with images. A spirit that perceives the spirit is formed differently and ordered in another way than one who contemplates the word of the spirit. From this, we learn how spiritual knowledge separates the spirit from the thoughts that fill it with images. But when it does not revolve around the images, the spirit approaches God.
...no imagination is useful for coming to God.
Now that you know this, you must strive every hour to pray to God without any meaningful image, without image or form, with a completely pure spirit and a cleansed soul, and with all fervor.