Answer:
He thought of that because probably Saint Thomas Aquinas believes in the value of a moral which says that man is an image or reflection of God.
Step-by-step explanation:
Gilbert Keith Chesterton (29th May, 1874 – 14th June, 1936) was an English writer, philosopher, lay theologian, also a literary and art critic. He was one of the prominent personalities of the London literary scene in the early twentieth century.
G. K. Chesterton had a natural interest and fascination for Saint Thomas Aquinas' philosophy. He contrasts Thomas Aquinas' idea of looking at man as a whole with thinkers rather than a beast. Saint Thomas Aquinas believes in the value of a moral which says that man is an image or reflection of God. So as a reflection of God, man has the capacity to think before he acts.