Charles H. Spurgeon on Psalms 101:3

I will set no wicked thing before mine eyes. I will neither delight in it, aim at it or endure it. If I have wickedness brought before me by others I will turn away from it, I will not gaze upon it with pleasure. The psalmist is very sweeping in his resolve, he declines the least, the most reputable, the most customary form of evil —no wicked thing; not only shall it not dwell in his heart, but not even before his eyes, for what fascinates the eye is very apt to gain admission into the heart, even as Eve's apple first pleased her sight and then prevailed over her mind and hand. I hate the work of them that turn aside. He was warmly against it; he did not view it with indifference, but with utter scorn and abhorrence. Hatred of sin is a good sentinel for the door of virtue. There are persons in courts who walk in a very crooked way, leaving the high road of integrity; and these, by short cuts, and twists, and turns, are often supposed to accomplish work for their masters which simple honest hearts are not competent to undertake; but David would not employ such, he would pay no secret service money, he loathed the practices of men who deviate from righteousness. He was of the same mind as the dying statesman who said, "Corruption wins not more than honesty." It is greatly to be deplored that in after years he did not keep himself clear in this matter in every case, though, in the main he did; but what would he have been if he had not commenced with this resolve, but had followed the usual crooked Policy of Oriental princes? How much do we all need divine keeping! We are no more perfect than David, nay, we fall far short of him in many things; and, like him, we shall find need to write a psalm of penitence very soon after our psalm of good resolution. It shall not cleave to me. I will disown their ways, I will not imitate their policy: like dirt it may fall upon me, but I will wash it off, and never rest till I am rid of it. Sin, like pitch, is very apt to stick. In the course of our family history crooked things will turn up, for we are all imperfect, and some of those around us are far from being what they should be; it must, therefore, be one great object of our care to disentangle ourselves, to keep clear of transgression, and of all that comes of it: this cannot be done unless the Lord both comes to us, and abides with us evermore.