The one subject one can't claim to have mastery on is eternity. As believers, we have the assurance of eternity because we have a risen saviour. It's only someone who has died and rose again that has the right to tell us what happens after death.

This teaching answers the following

1. Is there really life after death?

2. Do we really have hope of continuing our existence after we drop this body?

3. If there is such a life, how do we know?