One of the three types of mind.
"Unquestionably, the Sensual Mind develops its basic concepts via external sensory perceptions. Under these conditions the Sensual Mind is terribly crude and materialistic. It cannot accept anything which has not been physically demonstrated. Since the fundamental concepts of the Sensual Mind are based on external sensory data, undoubtedly, it can know nothing about what is real, about the truth, about the mysteries of life and death, about the Soul and the Spirit, etc. For the rogues of the intellect, totally trapped by their external senses and incarcerated within the basic concepts of the Sensual Mind, our esoteric studies are lunacy. In the reasoning of the unreasonable, in an insane world, they are right due to conditioning by the external sensory world. How could the Sensual Mind accept what is not sensory?" —Samael Aun Weor, The Great Rebellion