Charles Ellicott Commentary Deuteronomy 9:16

"And I looked, and, behold, ye had sinned against Jehovah your God; ye had made you a molten calf: ye had turned aside quickly out of the way which Jehovah had commanded you." — Deuteronomy 9:16 (ASV)

You had turned aside quickly. —The words of Jehovah in Deuteronomy 9:16, repeated here, and also recorded in Exodus 32:8. There is nothing so sad in human experience as the rapidity with which good resolutions and impressions fade from the natural heart of man.