The Lord fulfilled the prophecy he had given Jeremiah - Ezra 1:1
What tools has God used to mold you?
Cyrus issued a decree to free the people of Judah and have all the gold and silver returned
At first, it might appear acted out of compassion and love of God
He did not serve God but God stirred his heart
Cyrus was an instrument in God's hands as he worked out his will in his people's lives
When you submit to his will and purpose, he can even use thing you consider "secular".