Clement of Alexandria The Instructor Book II For ye are all children of the light, and children of the day; we are not of the night, nor of the darkness."[184] Tertullian De Fuga in Persecutione he wishes us to gain a lengthening of life, not by flight, but by wisdom. Besides, he who bids us shine as sons of light,[37] Origen Commentary on Matthew Book XII and are no longer the children of darkness or night, but have become the sons of day, and walk honestly as in the day;[231]