13 When therefore the mind has come to have sound eyes, what next? A. That she look. R. The mind's act of looking is Reason; but because it does not follow that every one who looks sees, a right and perfect act of looking, that is, one followed by vision, is called Virtue; for Virtue is either right or perfect Reason. But even the power of vision, though the eyes be now healed, has not force to turn them to the light, unless these three things abide.
Faith, whereby the soul believes that thing, to which she is asked to turn her gaze, is of such sort, that being seen it will give blessedness; Hope, whereby the mind judges that if she looks attentively, she will see; Charity, whereby she desires to see and to be filled with the enjoyment of the sight. The attentive view is now followed by the very vision of God, which is the end of looking; not because the power of beholding ceases, but because it has nothing further to which it can turn itself: and this is the truly perfect virtue, Virtue arriving at its end, which is followed by the life of blessedness.
Now this vision itself is that apprehension which is in the soul, compounded of the apprehending subject and of that which is apprehended: as in like manner seeing with the eyes results from the conjunction of the sense and the object of sense, either of which being withdrawn, seeing becomes impossible.
Source: Soliloquies (New Advent)