The spirit of man is the candle of the Lord, searching all the inward parts of the belly. Proverbs 20:27 KJV

God created man in His image, according to His likeness. Yes, God created man in His very own image, in the image of God He created him; male and female He created them (Gen. 1:26-27). The image of God is not physical, but spiritual. Since God is first and foremost both a Spirit and trinity (Father, Son, and Holy Spirit), man is also a spirit and tripartite being, i.e., spirit, soul, and body (1 Thess. 5:23).

Of all of creation:  minerals, rocks, plants, and animals—man differs from all animals because he can worship and fellowship with God, because man has a spirit (John 4:24). God by the spirit of man searches all things, even the inner most hidden and secret things. The spirit of man generally refers to the conscience.  The conscience serves as a candle (lamp) that shines light on thoughts, motives, affections, and actions. It will approve, disapprove, and reprove our innermost thoughts and intents (Rom. 8:26-28).

“But as it is written: “Eye has not seen, nor ear heard, nor have entered into the heart of man the things which God has prepared for those who love Him. But God has revealed them to us through His Spirit. For the Spirit searches all things, yes, and the deep things of God. For what man knows the things of a man except the spirit of the man which is in him? Even so no one knows the things of God except the Spirit of God. Now we have received, not the spirit of the world, but the Spirit who is from God, that we might know the things that have been freely given to us by God” (1 Cor. 2:9-12).

Besides God, no one knows what a man is thinking but himself. Likewise, the only one who can understand the things of God is the Spirit of God. The Holy Spirit operates through the human spirit to reveal the present blessings of salvation (John 14:26; 16:13), which includes “all spiritual blessings” from the Source—God Himself (Eph. 1:3). So, God uses the spirit of man as a candle along with the Holy Spirit to search our hearts so that we might know the things that are freely given to us by God.