Charles H. Spurgeon on Psalms 119:9

Thy word. The word is the only weapon (like Goliath's sword, none to equal this), for the hewing down and cutting off of this stubborn enemy, our lusts. The word of God can master our lusts when they are in their greatest pride: if ever lust rageth at one time more than another, it is when youthful blood boils in our veins. Youth is giddy, and his lust is hot and impetuous: his sun is climbing higher still, and he thinks it is a great while to night; so that it must be a strong arm that brings a young man off his lusts, who hath his palate at best advantage to taste sensual pleasure. The rigour of his strength affords him more of the delights of the flesh than crippled age can expect, and he is farther from the fear of death's gunshot, as he thinks, than old men who are upon the very brink of the grave, and carry the scent of the earth about them, into which they are suddenly to be resolved. Well, let the word of God meet this young gallant in all his bravery, with his feast of sensual delights before him, and but whisper a few syllables in his car, give his conscience but a prick with the point of its sword, and it shall make him fly in as great haste from them all, as Absalom's brethren did from the feast when they saw Amnon their brother murdered at the table. When David would give the young man a receipt to cure him of his lusts, how he may cleanse his whole course and way, he bids him only wash in the waters of the word of God. William Gumall.