Truly blessed is he who cleaves with his thought to the Prayer of Jesus, constantly calling to him in his heart, just as air cleaves to our bodies or the flame to the candle. The sun, passing over the earth, produces daylight; the holy and worshipful Name of Lord Jesus, constantly shining in the mind, produces a measureless number of sun-like thoughts. When the clouds disperse, the air appears pure. When passionate fantasies are dispersed by the Sun of Truth, Jesus Christ, radiant and star-like thoughts are naturally born in the heart, for Jesus illumines the air of the heart with his light. The wise Solomon says: "They that put their trust in him shall understand the truth; and such as be faithful in love shall abide with him" (Wisdom of Solomon 3:9).

(Hesychius of Jerusalem)