The fruit of the tree of life represents the steps we take in accepting God's love and the atonement.
God wants us to hear Him, to watch/worship Him, to remember the mitzvah (the instructions He has given us), receive ordinances, and study and live the Torah. And we do all these by grace. Yet there are still those that think there is a difference between grace and works.
There are different paths one may be called on within the kingdom of God. Each has its own duties and responsibility. We cannot choose these for ourselves but are called to them.