The difference between seriousness and Immersion

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

Question: In one of our sessions we came across the words, ‘seriousness’ and immersion’. Sir, there we only came to know about their surface meanings. There was no light thrown on their exact detailed meanings. What is the basic difference between them? Which one is more advantageous to inculcate…