"It has been said, and rightly so, that between contemplation and adoration there is so close a union, so mutual a relationship, that they cannot be separated. We adore while contemplating and we contemplate while adoring. The saints in heaven live in perpetual adoration, because their joy is derived from eternal contemplation. On earth, where in some manner we must imitate the life of heaven, Christian devotion has striven to make the Sacred Host the center of perpetual contemplation and adoration, as far as human frailty permits. And both adoration and contemplation have called for perpetual exposition of the Blessed Sacrament.
"The Sacred Host perpetually exposed on its Eucharistic throne, and, before it, day and night, loving souls in adoration and contemplation! Is this not truly heaven on earth?"
(From "The Holy Eucharist" by Jose Guadalupe Trevino)