“There is no peace," says my God, "for the wicked" (v21). Isaiah declared that God was furious with the Israelites for getting involved in all sorts of horrible idolatrous practices, including sexual immorality, religious prostitution, and sacrificing children (v4-9). They thought the idols would satisfy and protect them, but instead of peace, they found destruction. Their only hope was to humbly cast themselves on the Lord, who dwells “in the high and holy place, and also with him who is of a contrite and lowly spirit” (v15).
God welcomes us when we turn from sin and seek His refuge. He wants “to revive the spirit of the lowly, and to revive the heart of the contrite” (v15).