Adam Clarke on Psalms 71:11

God hath forsaken him - "God, who has been his special help all through life, and who has guarded him so that no hand could be raised successfully against him, has now cast him off; therefore we shall easily prevail against him. His present adversity shows that God is no longer his friend." Thus men judge. "Secular prosperity is a proof of God's favor: adversity is a proof of his displeasure." But this is not God's way, except in especial judgments, etc. He never manifests his pleasure or displeasure by secular good or ill.