Oliver O’Donovan on theoretical and practical reason
We know only as we love. Knowledge, which participates in the eternal Word of God, is consubstantial and coeternal with the Love that is God’s eternal Spirit. All knowledge, then, has an affective aspect, just as all love has a cognitive aspect. Our experience of knowing is that of discerning good and welcoming it as good. To know any thing is to grasp its inherent intelligibility, which is its good; but to grasp its intelligibility is to grasp it; and, in grasping it; to cling to it in love.
from Common Objects of Love, (Eerdmans, 2002), 11.