With youth: How do I know whether I really understand it?

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

Questioner (Q): Sir, how do I know whether I am really understanding something or not?

Acharya Prashant (AP): Understanding is not some knowledge that you can hold and store here (pointing towards the brain). It has to become your life. If it is not…