Our holy fathers have renounced all other spiritual work and concentrated wholly on this one doing, that is, on guarding the heart, convinced that, through this practice, they would easily attain every other virtue, whereas without it not a single virtue can be firmly established.
St. Symeon the New Theologian
Blessed is he who always has before his eyes that "the earth is the Lord's and the fulness thereof" (Ps. 23:1), and keeps in mind that God is powerful to arrange for His servants as is pleasing to Him.
