John Calvin Commentary Psalms 78:11

"And they forgat his doings, And his wondrous works that he had showed them." — Psalms 78:11 (ASV)

And they forgot his works. This shameful impiety is portrayed here as originating in ingratitude, since they wickedly buried and took no account of the deliverance accomplished for them, which was worthy of everlasting remembrance. Truly, it was a stupidity more than animal-like, or rather, so to speak, a monstrous thing for the Israelites to depart from God, to whom they were under so many and strong obligations.

Nor would it have been possible for them to have been so deceived by Satan if they had not completely forgotten the many miracles performed for their benefit, which formed so many bonds to keep them in the fear of God and in obedience to him. So that no excuse might be left for lessening their guilt, the prophet dignifies those works by applying the term wonderful to them. He thus implies that God’s way of acting was not ordinary, which might otherwise easily explain their gradually forgetting his works. Instead, the Israelites had willfully and wickedly shut their eyes so that they might not be restrained in their sinful course by seeing the glory of God.