Charles H. Spurgeon on Psalms 119:29

Remove from me the way of lying. Here he acknowledgeth that although he were already exercised in the law of God and in his knowledge, and that although he were a prophet to teach others, nevertheless he was subject to a number of wicked thoughts and imaginations which might always wickedly lead him from the right way, except God had held him with his mighty and strong hand. And this is a point which we ought here rightly to note; for we see how men greatly abuse themselves. When any of us shall have had a good beginning, we straightway think that we are at the highest; we never bethink us to pray any more to God, when once he hath showed us favour enough to serve our turns; but if we have done any small deed, we by and by lift up ourselves and wonder at our great virtues, thinking straightway that the Devil can win no more of us. This foolish arrogancy causeth God to let us go astray, so that we fall mightily, yea, that we break both arms and legs, and are in great hazard of breaking our necks. I speak not now of our natural body, but of our soul. Let us look upon David himself; for he it is that hath made proof hereof. It came to pass that he villainously and wickedly erred when he took Bathsheba the wife of his subject, Uriah, to play the whoremonger with her, that he was the cause of so execrable a murder, yea, and that of many; for he did as much as in him lay, to cause the whole army of the Lord and all the people of Israel to be utterly overthrown. See, then, the great negligence and security into which David fell; and see also wherefore he saith, "Alas, my good God, I beseech thee so to guide me, that I may forsake the way of lying." John Calvin.