We must see the Eucharist not only as a memorial of what Jesus has done. We must see the Eucharist as a memorial of what Jesus has done in us. In the Gospels, no one was so grateful as the people that Jesus had reached out and touched with his healing hand. Those who understood what had happened to them broke out in praise of God. This was especially true when the healing was both spiritual and physical. St. Luke tells the story of the paralyzed man whom Jesus healed in soul and body (Lk 5).
It was important that the paralyzed man knew that he was powerless to begin with. Powerlessness is absolutely necessary for seeking healing. Likely, he also knew he was a sinner. That provided him with the necessary humility. He went home praising God, not because that was what he was supposed to do but because he was overwhelmed. Our gratitude is essential to our spiritual life. God does not need our gratitude; we do!
Give me a spirit of gratitude, Lord, to remind me constantly of your care of me. Then I will be much less likely to give way to sadness and relapse into my old ways.