Beyond the Material Five Senses are Subtle Spiritual Senses: Spiritual Seeing, Spiritual Hearing, etc…:

“Since the exterior senses, by hearing, by sight, by the sense of smell and of touch, are not able to search out the innermost mysteries of the natures, on this account God conceals within the inner members a nature having senses more subtle than all the bodies. Now because of the subtleness of its stirrings, this nature searches out the hidden wisdom of the things created by the Lord of all.” (John the Solitary, “John the Solitary On the Soul”, Syriac mystic)

In addition to the categories of apocrypha including New Testament apocrypha, as in alternative gospels and other writings of the first few centuries CE, Nag Hammadi Library and other collections or discoveries of Gnostic texts, there is another genre I’m an avid reader of: the Syriac mystics.