Ezra 1:1 (ESV)

1 In the first year of Cyrus king of Persia, that the word of the LORD by the mouth of Jeremiah might be fulfilled, the LORD stirred up the spirit of Cyrus king of Persia, so that he made a proclamation throughout all his kingdom and also put it in writing:

The Lord is working in history to keep his promises. He uses pagan kings such as Cyrus to accomplish his plans. He keeps his promises. God is thus sovereign (in complete control) and faithful (keeping his Word).