"What then can you meditate upon with greater profit and pleasure than these [spiritual] things? For when we examine them, and these thoughts prevail in the soul, no evil thoughts will gain entry into us. Then it will come about that, as we learn of His benefits, we will increase in longing for our Benefactor. When we thus greatly love Him we become keepers of His commandments and participants in His purpose, for as He says, 'he who loves Me will keep My commandments' (Jn. 14:15, 21).
Besides, when we recognize how great is our own worth, we shall not readily betray it. We will not endure being slaves to a runaway slave when we have found out that a kingdom is ours. We shall not open our mouth in evil speech when we recollect the sacred banquet and that Blood which has reddened our tongue. How can we use our eyes to look on that which is not seemly when we have enjoyed such awesome Mysteries? We shall not move our feet nor stretch forth our hands to any wicked thing if the recollection of these things is active in our souls." - St. Nicholas Cabasilas, The Life in Christ, 6, §4