Proverbs 15:26
26 The thoughts of the wicked are an abomination to the LORD: but the words of the pure are pleasant words.
Nothing is hidden to the LORD, not even our thoughts. Every thought of man is known to Him. The LORD searches our hearts and discerns our thoughts. The LORD said in Isaiah 66:18, “For I know their works and their thoughts”.
The gospel-writers corroborate this crystal-clear fact. Matthew wrote: “And Jesus knowing their thoughts said, Wherefore think ye evil in your hearts?” (Matthew 9:4); Mark recorded Jesus as saying: “For from within, out of the heart of men, proceed evil thoughts, adulteries, fornications, murders, thefts, covetousness, wickedness, deceit, lasciviousness, an evil eye, blasphemy, pride, foolishness: all these evil things come from within, and defile the man” (Mark 7:21-23).
Every man, being totally depraved, has a corrupt mind that cherishes evil thoughts. The LORD said in Genesis 8:21, “for the imagination of man’s heart is evil from his youth” (cf. Genesis 6:5). Ecclesiastes 7:20 declares, “For there is not a just man upon earth, that doeth good, and sinneth not.” Be that as it may, when people repent and turn to God for salvation, He says, “I will put my laws into their hearts, and in their minds will I write them” (Hebrews 10:16). When God saves people, He empowers them by His Word and His Spirit to be transformed by the renewing of their mind, that they may prove what is that good, and acceptable, and perfect, will of God (cf. Romans 12:2; Ephesians 4:22-24).
But the wicked in their unregenerate state, having neither the Spirit nor the Word, continually take pleasure in their thoughts that are abominable to God. Even though the wicked may appear before men as charitable and generous, the LORD knows that their thoughts are continually evil. A person may feign to be a righteous and kind person, but God searches his thoughts and finds them to be abominable or detestable.
However, the LORD takes pleasure in the words of those who have trusted Him for their cleansing. Their words reflect their thoughts, which are humble, contrite, grateful and obedient before Him. So let this be our prayer: “Let the words of my mouth, and the meditation of my heart, be acceptable in thy sight, O LORD, my strength, and my redeemer” (Psalm 19:14).