After the Liturgy of the Word, and the profession of faith, we come to the Liturgy of the Eucharist. All throughout the Mass the congregation responds to the Priest's prayers. Through your goodness we have this bread to offer, which earth has given and human hands have made. It will become for us the bread of life. The simplest meaning of these words are, that 'bread' that God has provided, and 'human hands have made' will become an offering unto God.
Bread is made from grains, grains are fruit from the ground.
And Abel, on his part also brought of the firstlings of his flock and of their fat portions. Through your goodness we have this wine to offer, fruit of the vine and work of human hands. It will become our spiritual drink. This sacrifice has a definite purpose. The forgiveness of the priests sins as well as the congregation.