Matthew Henry Commentary Judges 17:7-13

"And there was a young man out of Beth-lehem-judah, of the family of Judah, who was a Levite; and he sojourned there. And the man departed out of the city, out of Beth-lehem-judah, to sojourn where he could find [a place], and he came to the hill-country of Ephraim to the house of Micah, as he journeyed. And Micah said unto him, Whence comest thou? And he said unto him, I am a Levite of Beth-lehem-judah, and I go to sojourn where I may find [a place]. And Micah said unto him, Dwell with me, and be unto me a father and a priest, and I will give thee ten [pieces] of silver by the year, and a suit of apparel, and thy victuals. So the Levite went in. And the Levite was content to dwell with the man; and the young man was unto him as one of his sons. And Micah consecrated the Levite, and the young man became his priest, and was in the house of Micah. Then said Micah, Now know I that Jehovah will do me good, seeing I have a Levite to my priest." — Judges 17:7-13 (ASV)

Micah thought it was a sign of God's favor to him and his images, that a Levite should come to his door. Thus, those who please themselves with their own delusions, if Providence unexpectedly brings anything to their hands that furthers them in their evil way, are therefore apt to think that God is pleased with them.