Learned circles consider a disciplic line bereft of a commentary on the Vedānta-sūtra to be unauthorized and useless. Śrīpāda Śaṅkarācārya's Vedānta commentary, entitled Śārīraka-bhāṣya, is the main commentary of the impersonal, monistic school. Among the Vaiṣṇavas, besides Śrīpāda Rāmānujācārya's commentary, Śrīla Baladeva Vidyābhūṣaṇa's Govinda-bhāṣya is the main commentary in the line of Lord Caitanya, known as the Mādhva-Gauḍīya-sampradāya.
Those who are keen to engage in deep discussions on the esoteric conclusions of the scriptures should certainly delve into the philosophy of the Vedānta-sūtra. The point to be emphasized is that a well-versed Vedānta philosopher is not a philosopher in the line of Śaṅkarācārya but is actually a Vaiṣṇava spiritual preceptor, a liberated soul.
According to the Vedas and the sages, the five gross elements are earth, water, fire, air, and ether. Material nature is produced from a combination of false ego (ahaṅkāra), the ingredients of the material energy (mahat-tattva), and the cause of the mahat-tattva (prakṛti). There are five knowledge-gathering senses and five working senses. The mind is the internal sense, the sixth knowledge-gathering sense. Form, taste, smell, touch, and sound are the five sense objects.