On Shrimad Bhagwad Gita: What is common between saint and sinner, animal and man?

The following is an excerpt from a samvaad (dialogue) session with Acharya Prashant.

विद्याविनयसम्पन्ने ब्राह्मणे गवि हस्तिनि ।

शुनि चैव श्वपाके च पण्डिता: समदर्शिन: ।।

vidyā-vinaya-sampanne brāhmaṇe gavi