Isaiah 57:16

God will not always be angry with sinners; His anger will come to an end because He has made provision for human sin through the Servant. He becomes angry, but He is love (cf. Psalms 30:5). If God remained angry with sin, humanity could not endure His wrath and everyone would perish (cf. Genesis 6:3). Obviously God remains angry with sinners who refuse His grace, but He does not need to remain angry with the humble who accept His provision for their sins.