Matthew 15:36

Now a man came from Baal-shalishah, and brought the man of God bread of the first fruits, twenty loaves of barley and fresh ears of grain in his sack. And he said, “Give them to the people that they may eat.”

And ordering the crowds to sit down on the grass, He took the five loaves and the two fish, and looking up toward heaven, He blessed the food. And breaking the loaves, He gave them to the disciples, and the disciples gave them to the crowds,

“Or the seven loaves of the four thousand, and how many large baskets full you picked up?

Jesus then took the loaves, and having given thanks, He distributed them to those who were seated; likewise also of the fish, as much as they wanted.

He who regards the day, regards it for the Lord, and he who eats, eats for the Lord, for he gives thanks to God; and he who does not eat, for the Lord he does not eat and gives thanks to God.

Otherwise if you bless in the spirit only, how will the one who fills the place of the uninformed say the “Amen” at your giving of thanks, since he does not know what you are saying?