“The heart, dear friends, that covets the sight of God as in a mirror must keep itself free from worldly cares, from harmful, unnecessary and even necessary ones. It must keep itself ever alert through reading, meditation and prayer. Blessed are the pure of heart; they shall see God. May He grant that we so do. Amen.”
Isaac of Stella (c. 1100-1169) in Sermons on the Christian Year volume 1, trans. Hugh McCaffery (Kalamazoo, MI: Cistercian Publications, 1979) 209.