Letting go is easy for some and hard for others. If you find yourself struggling to let go, think of the tree. Notice how the tree never ceases growing roots. Notice how the tree sheds its leaves each year and then grows new leaves. Notice how the tree never strains to keep leaves that no longer belong. Notice how the tree stands and grows in all types of weather (circumstance).
Observe the tree; it gives you the best example of how you should approach life.