The senses are for perceiving; the mind creates uncertainty. The understanding brings all knowledge to certainty. The Soul exists as a witness.
चक्षुरालोचनायैव संशयं कुरुते मनः। बुद्धिरध्यवसानाय क्षेत्रज्ञः : साक्षिवत् स्थितः॥