Jesus Christ, our incarnate God, is substantially Present with us in the Holy Eucharist. We cannot see Him within the Sacred Host. But we who believe in His words accept the truth about His Presence, rejoice in it - and are eager to show our love and devotion in traditional ways of adoration, reverence, and with processions and hymns.
When a priest is holding the monstrance with the Sacred Host, and blesses us with it, Christ Himself is blessing us, even though we do not see Him. It's as if He stands there in front of us, holding up His right hand in blessing, glad to be with those who love Him.
A child needs to learn that the body and soul make one unique person. The body is made alive by the soul. The soul can never die; but when it leaves the body, the body dies. Until that time, a person should feed his body with food and drink, and feed his soul with spiritual food and drink, which is Jesus Himself, 'Hidden' in the Sacred Host or chalice.
In the Story of Narnia there is a healing liquid which was used to bring a wounded boy back to health. The Precious Blood of Christ, received in Holy Communion, at Mass (also received, even when we only consume the Sacred Host), is like a healing liquid which makes us ready for Eternal Life. Knowing this, who can say, without seeming foolish, 'I can't be bothered to go to Mass'.
Christ sees every tiny act of charity that we do for love of Him. He sees each one as being like a personal gift to Him - or like a rose-petal thrown by a child in His honour, where He is Present in the Most Blessed Sacrament, as the Sacred Host in carried along in a monstrance, by a priest, for the faithful to venerate and adore.
Within the Sacred Host there is a greater power than nuclear power, or dynamite. It is the power of God, which sets to work in human beings who are willing to change. It is the power that transforms weak people into Saints: with wills entirely devoted to doing God's Will, and - for some - to doing amazing works to benefit humanity.
Some people treat the Sacred Host as if it is merely a bit of bread and not Christ Himself with us in sacramental form under the appearance of bread. They neither respect nor adore Christ, whether from ignorance, carelessness or indifference: yet He is our Saviour and our God.