He did that which was right - He began his reign well, but soon became an idolater, 2 Chronicles 25:14, 2 Chronicles 25:15.

And he did that which was {a} right in the sight of the LORD, but not with a perfect heart.

(a) Meaning, in respect to his predecessors, though he had his imperfections.

25:2 But not, and c. - He was not an enemy to religion, but a cool and indifferent friend. He was not a man of serious piety; for his heart was not whole with God.

25:1-13 Amaziah was no enemy to religion, but cool and indifferent friend. Many do what is good, but not with a perfect heart. Rashness makes work for repentance. But Amaziah's obedience to the command of God was to his honour. A firm belief of God's all-sufficiency to bear us out in our duty, and to make up all the loss and damage was sustain in his service, will make his yoke very easy, and his burden very light. When we are called to part with any thing for God and our religion, it should satisfy us, that God is able to give us much more than this. Convinced sinners, who have not true faith, always object to self-denying obedience. They are like Amaziah; they say, But what shall we do for the hundred talents? What shall we do if by keeping the sabbath holy we lose so many good customers? What shall we do without this gain? What shall we do if we lose the friendship of the world? Many endeavour to quiet their consciences by the pretence that forbidden practices are necessary. The answer is, as here, The Lord is able to give thee much more than this. He makes up, even in this world, for all that is given up for his sake.