During the days of His mortal life Jesus was present in one place only; He dwelt in one house only. Few persons were privileged enough to enjoy His presence and listen to His words. But today in the Most Blessed Sacrament, He is, so to speak, present everywhere at one and the same time. In a way His humanity shares the prerogative of His Divine immensity which fills all things. Jesus is present in His entirety in an infinite number of temples and in each one of them; Since all the Catholics scattered throughout the world are members of His Mystical Body, it does seem necessary that He, as the soul of it, should be everywhere, present throughout the whole body, giving it life, and sustaining it in each one of His members.
ST. PETER JULIAN EYMARD The Real Presence