He will not always chide; or, contend (see Isaiah 57:16; and comp. Jeremiah 3:5, Jeremiah 3:12). God will relent from his anger and forgive men, after a while. He will not be "extreme to mark what is done amiss."
Neither will he keep his anger forever. He is not implacable. He will accept repentance and amendment (Ezekiel 18:27) He will accept atonement (1 John 2:2).