The body's surface organs explain the nature and reveal the qualities of things in our environment. But without the mind such explanation and such revelation could never be possible. This is easily proven. When we withdraw the mind from the sense-organs, as in deep thinking or profound remembrance, we alienate the environment and hardly observe the things in it. In other words, we sense ultimately only what the mind senses.
-- Notebooks Category 21: Mentalism > Chapter 1: The Sensed World > # 36