Charles H. Spurgeon on Psalms 119:113

I hate vain thoughts. In those vacant hours which are spared from business, pleasure, company, and sleep, and which are spent in solitude, at home or abroad; unprofitable, proud, covetous, sensual, envious, or malicious imaginations, occupy the minds of ungodly men, and often infect their very dreams. These are not only sinful in themselves, indicating the state of their hearts, and as such will be brought into the account at the day of judgment; but they excite the dormant corruptions, and lead to more open and gross violations of the holy law. The carnal mind welcomes and delights to dwell upon these congenial imaginations, and to solace itself by ideal indulgences, when opportunity of other gratification is not presented, or when a man dares not commit the actual transgression. But the spiritual mind recoils at them; such thoughts will intrude from time to time, but they are unwelcome and distressing, and are immediately thrust out; while other subjects, from the word of God, are stored up in readiness to occupy the mind more profitably and pleasantly during the hours of leisure and retirement. There is no better test of our true character, than the habitual effect of "vain thoughts" upon our minds whether we love and indulge them, or abhor, and watch and pray against them. Thomas Scott, 1747-1821.