Ambrose of Milan — as excerpted in the Catena Aurea on Luke 10:25-28

“For he was one of those who think themselves skilled in the law, and who keep the letter of the law, while they know nothing of its spirit. From a part of the law itself our Lord proves them to be ignorant of the law, shewing that at the very first the law preached the Father and the Son, and announced the sacraments of the Lord’s Incarnation; for it follows, And he answering said, Thou shall love the Lord thy God with all thy heart, and with all thy soul, and with all thy strength, and with all thy mind.”