Our lives are full of losses—losses of dreams and losses of friends and losses of family and losses of hopes. Over time, there are more and more things we can be negative about. Resentment makes us cling to our failures or disappointments and complain about the losses in our lives. Resentment gives us a hardened heart, and we become resentful people.
Gratitude in its deepest sense means to live life as a gift to be received gratefully. But gratitude as the gospel speaks about it embraces all of life: the good and the bad, the joyful and the painful, the holy and the not so holy.
Jesus calls us to gratitude. He calls us to recognize that gladness and sadness are never separate, that joy and sorrow really belong together, and that mourning and dancing are part of the same movement. That is why Jesus calls us to be grateful for every moment that we have lived and to claim our unique journey as God's way to mold our hearts to greater conformity with God's own.