This needs to be something you have thought through and learned about and pondered. So don't feel under any pressure. This passage of Scriptures talks about a problem that every human being faces. The problem is described in v.15 - through fear of death we are subject to slavery all of our lives. We know that we all face death.
Death is inevitable.
So we all know that the day is coming when we will die. That is, we have bought into idea that all we are is physical matter. There is no soul. There is no spirit. All you are is amino acids and protoplasm and electro-chemical interactions.