Charles Spurgeon Commentary Exodus 32:18-19

"And he said, It is not the voice of them that shout for mastery, neither is it the voice of them that cry for being overcome; but the noise of them that sing do I hear. And it came to pass, as soon as he came nigh unto the camp, that he saw the calf and the dancing: and Moses` anger waxed hot, and he cast the tables out of his hands, and brake them beneath the mount." — Exodus 32:18-19 (ASV)

And he said, It is not the voice of them that shout for mastery, neither is it the voice of them that cry for being overcome: but the noise of them that sing do I hear. And it came to pass, as soon as he came nigh unto the camp, that he saw the calf, and the dancing: and Moses' anger waxed hot, and he cast the tables out of his hands, and brake them beneath the mount.

This is he who had been praying to God, and saying, "Why doth thy wrath wax hot against thy people?" Now he is in deep sympathy with God, and he himself is angry with the idolaters. He cannot help it when he begins to see their sin. Before, he had only thought of the people; but now he looks at their sin.

When you see sin, if you are a man of God, your wrath grows hot, and you enter into sympathy with that holy God who cannot help but be indignant at iniquity, wherever it may be.