Charles H. Spurgeon on Psalms 119:113

I hate vain thoughts: but thy law do I love. In this paragraph the Psalmist deals with thoughts and things and persons which are the opposite of God's holy thoughts and ways. He is evidently in great fear of the powers of darkness, and of their allies, and his whole soul is stirred up to stand against them with a determined opposition. Just as he began the octave, Psalms 119:97, with "O how I love thy law, "so here he begins with a declaration of hatred against that which breaks the law. The opposite of the fixed and infallible law of God is the wavering, changing opinion of men: David had an utter contempt and abhorrence for this; all his reverence and regard went to the sure word of testimony. In proportion to his love to the law was his hate of man's inventions. The thoughts of men are vanity; but the thoughts of God are verity. We hear much in these days of "men of thought, ""thoughtful preachers, "and "modern thought": what is this but the old pride of the human heart? Vain man would be wise. The Psalmist did not glory in his thoughts; and that which was called "thought" in his day was a thing which he detested. When man thinks his best his highest thoughts are as far below those of divine revelation as the earth is beneath the heavens. Some of our thoughts are specially vain in the sense of vain glory, pride, conceit, and self trust; others in the sense of bringing disappointment, such as fond ambition, sinful dreaming, and confidence in man; others in the sense of emptiness and frivolity, such as the idle thoughts and vacant romancing in which so many indulge; and, yet once more, too many of our thoughts are vain in the sense of being sinful, evil, and foolish. The Psalmist is not indifferent to evil thoughts as the careless are; but upon them he looks with a hate as true as was the love with which he clung to the pure thoughts of God.

The last octave was practical, this is thoughtful; there the man of God attended to his feet, and here to his heart: the emotions of the soul are as important as the acts of the life, for they are the fountain and spring from which the actions proceed. When we love the law it becomes a law of love, and we cling to it with our whole heart.