The Lord continues his rebuke of Israel. Not only was it Israel who left the Lord, but the Lord was not passive on his end of the covenant. While Israel was distant from the Lord, the Lord yet called to them - but they did not hear and did not answer. Thus it is with the Lord. He is always there, always calling, and we have but to recognize his voice and answer.
As part of the Lord's rebuke of Israel, he reminds them that they ought to turn to him, for he has the power to save: "have I no power to deliver?" After asking this rhetorical question, the Lord reminds Israel of his awesome control over the very elements.