"God, the arrogant have risen against me, etc. But You, Lord, are merciful and gracious." Rabbi Shmuel bar Nachmani said that God extends His patience with the wicked and then punishes them, but He extends His patience with the righteous and rewards them with good and peace. Rabbi Acha said in the name of Rabbi Tanchum bar Chiya that God initially extends His patience, but once He begins to punish, He pushes away His anger, as it is said, "They come from a faraway land, from the end of the heavens—the Lord and the weapons of His anger."
It is compared to a king who had evil troops, and every rebellious state that rose against him, he would send them to destroy it. What did the king do? He pushed them away from his kingdom so they wouldn't damage it. Rabbi Berachiah said in the name of Rabbi Levi that the angel appointed over anger is far away, as it is said, "They come from a faraway land."
God said that if He were to get angry with the people until His anger was quenched, they would come to Him in large groups, but He accepts them and they are, so to speak, "spared." Therefore, be patient.