For the commandment is a lamp; and the law is light; and reproofs of instruction are the way of life:
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Cyril of Alexandria
AD 444
Solomon also writes that “the commandment of the law is a lamp and a light.” This sensible light that is in the world, by falling on our bodily eyes, dispels the darkness. So also the law of God, when admitted into the mind and heart of people, illuminates it thoroughly and does not allow it to fall against the stumbling blocks of ignorance or be caught in the thickets of sin. Commentary on Luke, Homily