A very simple answer – we must kneel before the Blessed Sacrament!
Why do we have to kneel? What is so special about the Blessed Sacrament that we must kneel in front of it? The Blessed Sacrament is the Body of our Lord Jesus Christ in the form of the bread. Just like He said to His apostles in the Last Supper, “This is my Body.” And whoever eats this bread will have an Eternal Life.
If the bread is our Lord Jesus Christ, why we should kneel before it? Jesus Christ is our God, one of the Three Persons in the Holy Trinity. He is our Creator, and we, as His creations, we must kneel before Him. We must show our respect and adoration before the Blessed Sacrament, because this is the Body of our God.
Another reason is that Our Lord Jesus Christ is also our King, our Supreme Leader, and the King of all Kings. During the ancient times, the people must kneel before the King. But the generation today doesn’t do this anymore. Because the lack of religious and Catholic education. When we go to the mass, while the Priest lifted the Holy Eucharist, few people doesn’t kneel before the Blessed Sacrament. Most people who kneel are the ones inside the bench while others remains standing because they do not know what they must do. And some know these but they don’t want to kneel because their pants, skirts or their exposed knee will get dirty. They chose not to get dirt but forgot that they disrespect the Blessed Sacrament, the Body of our Lord.