Gratefulness has three steps: not missing the opportunity, appreciating the opportunity, and using or enjoying the opportunity. By this method we come fully alive, full of joy, which is what we are all longing for.
Every person has a share in this world and a share in the world to come. We understand the concept of a share in the world to come, but what does it mean having a share in this world? Open your hearts. Having a share in this world means I know exactly what I have to do in this world. This is a very high level. If I know that if I don't do it, it just won't happen. Then I've just got to do it. This is my share in this world.