“Theologians distinguish between perfectio sustanstialis in the soul and perfectio simpliciter. They tell us that where there is no mortal sin, there is substantial perfection: there are grounds for a further perfection, and the soul is at least perfectly alive.
The other kind of perfection, considered simply as sanctity, is the plentitude to which earnest souls feel called to aspire. The Holy Eucharist ministers to each of these perfections: in the first instance, the soul is actively helped to keep itself in a state of grace; in the second, its horizons of love are enlarged.
If love is the “bond of perfection” and the Holy Eucharist is the sacrament of love, then Holy Communion not only draws together outward behaviour and inward motive but also raises perfectio substantialis toward perfectio simpliciter.”
Grace alone can bring God’s mysteries nearer to me, and until it explains God’s ways to me, my vision, even aided by the truths of revelation and the theology of the Church, is wretchedly incomplete.”
~Dom Hubert van Zeller