“My prayer is not for them alone. I pray also for who will believe in me through their message, that all of them may be one, Father, just as you are in me and I am in you. May they also be in us so that the world may believe that you have sent me. I have given them the glory that you gave me, that they may be one as we are one—I in them and you in me—so that they may be brought to complete unity. Then the world will know that you sent me and have loved them even as you have loved me. (John 17:20-23)By consuming the Body and Blood of Christ, we truly become one and united with Christ's humanity and divinity in the most intimate way. The Blood of Christ flows in our veins, and His flesh is one with our flesh. Christ also said that he who eats His Body will have eternal life (John 6:51).
If the seed of faith in us does not grow, it becomes a dead faith. Living faith works through charity (CCC 1814). For many of us, our faith is still at the infantile stage, but the Apostle Paul encouraged us to always persevere and grow in the faith otherwise this priceless gift can be lost (see 1 Timothy 1:18-19 and CCC 162).