Charles H. Spurgeon on Psalms 119:36

Not to covetousness. He prays in particular that his heart may be diverted from covetousness, which is not only an evil, but as saith the Apostle, "the root of all evil." David here opposes it as an adversary to all the righteousness of God's testimonies: it inverts the order of nature, and makes the heavenly soul earthly. It is a handmaid of all sins; for there is no sin which a covetous man will not serve for his gain. We should beware of all sins, but specially of mother sins. William Cowper.