It is said, great are the senses (over material body); greater than the senses is the mind; greater than the mind is the understanding. That which is greater then the understanding is the (Self).
इन्द्रियाणि पराण्याहुरिन्द्रियेभ्यः परं मनः। मनसस्तु परा बुद्धिर्यो बुद्धेः परतस्तु सः॥