For such is the power of great minds, such is the light of truly believing souls, that they put unhesitating faith in what is not seen with the bodily eye; they fix their desires on what is beyond sight. Such fidelity could never be born in our hearts, nor could anyone be justified by faith, if our salvation lay only in what was visible. And so our Redeemer's visible presence has passed into the sacraments. ~St. Leo the Great