Humble and contrite

Key verses
Hebrews 13:20-21 - May the God of peace, who through the blood of the eternal covenant brought back from the dead our Lord Jesus, that great Shepherd of the sheep, equip you with everything good for doing his will, and may he work in us what is pleasing to him, through Jesus Christ, to whom be glory for ever and ever.

Isaiah
God saves his people.  This is evident in Isaiah's narrative.  Although they were sinful and had to be punished, God did rescue them and bring them out of the pit into the light of his blessing.

Even when sacrifices were required by Jewish law, they weren't an excuse for sin.  Isaiah 66:2 explains that what God desires most is someone who follows him, who is "humble and contrite in spirit".  Sacrifices were still necessary to cover for the sin that was still committed, but sacrifices on their own, without a real commitment to a right way of living, were not enough.