At first a living creature perceives various objects through the senses. With Mind he reflects over them, and then with the help of Understanding, he arrives at certainty of knowledge. Endued with Understanding, one arrives at certainty of conclusions regarding objects perceived through the senses.
पूर्वं चेतयते जन्तुरिन्द्रियैर्विषयान् पृथक्। विचार्य मनसा पश्चादथ बुद्ध्या व्यवस्यति। । इन्द्रियैरुपलब्धार्थान् बुद्धिमांस्तु व्यवस्यति॥