Charles Spurgeon Commentary 2 Chronicles 12:13-14

"So king Rehoboam strengthened himself in Jerusalem, and reigned: for Rehoboam was forty and one years old when he began to reign, and he reigned seventeen years in Jerusalem, the city which Jehovah had chosen out of all the tribes of Israel, to put his name there: and his mother`s name was Naamah the Ammonitess. And he did that which was evil, because he set not his heart to seek Jehovah." — 2 Chronicles 12:13-14 (ASV)

So king Rehoboam strengthened himself in Jerusalem, and reigned: for Rehoboam was one and forty years old when he began to reign, and he reigned seventeen years in Jerusalem, the city which the LORD had chosen out of all the tribes of Israel, to put his name there. And his mother's name was Naamah an Ammonitess.

And he did evil, because he prepared not his heart to seek the LORD.

He was one of that fickle sort, neither here nor there; a compromising gentleman, not very definite in anything; he would go right if he were driven that way, and he would go wrong if he were led in that direction. Oh, how many there are who never prepare their hearts to seek the Lord! They are not determinately bad; they have not enough backbone in them to be leaders in evil; but they are never good for much, because they have never made up their minds to do the right at all costs; they have never had their heart prepared by the Holy Spirit to seek the Lord.