15.1 What is sin?
ANSWER:
We sin when we disobey God's law.
See 1 John 3:4.

15.2 Who tempts us to sin?
ANSWER:
Temptation to sin comes out of our own minds and bodies; we are tempted by our own "human nature". The apostle Paul called this the "law of sin" in his body. Sometimes other human beings persuade us to give in to the sinful desires of our own nature.
See James 1: 14-15; Mark 7:21-23; Jeremiah 17:9; Romans 7:18-25; Romans 5:12; Proverbs 1:10.

15.3 What is "the devil" ?
ANSWER:
The devil is a kind of parable of the wickedness of human nature. Unchanged human nature is displeasing to God. He shows this by calling it "the devil". Wicked men are also sometimes called "the devil".
See John 6: 70: John 8:44; 1 John 3:8; Revelation 2:10.

15.4 What happens if we give in to the wicked desires of our human nature, and so live sinful lives?
ANSWER:
We shall die. That is why the Bible says that the devil
(human nature) has "the power of death".
See Romans 6:23; Hebrews 2:14.

15.5 What did the Lord Jesus do to the devil?
ANSWER:
The Bible says that the Lord Jesus destroyed the devil. This proves that the devil cannot be a great evil monster, who is alive today. Our Lord had a human nature just like us, and he was tempted to sin just as we are. This means that the Lord Jesus had to struggle against "the devil" (his own natural desires) just as we do. But, unlike us, the Lord won every struggle; never once did he give in to temptation, and so "the devil" was defeated. Since Jesus Christ rose from the dead, he has had an immortal body and no longer faces temptation. For him, human nature ("the devil") has been destroyed and is dead.
See Hebrews 2:14; Hebrews 4:15; Romans 6:6- 10; 1 John 3:8.

15.6 What does "Satan" mean?
ANSWER:
It is a Hebrew word meaning "the enemy" (the Old Testament was written in Hebrew). Sometimes it is translated "enemy" or "opponent", or (in the King James translation) "adversary", and sometimes it is used as a name. Peter opposed the Lord Jesus, so Jesus said to Him: "Get thee behind me, Satan". Human nature is God's greatest enemy (and ours too!), so the New Testament calls it "Satan" in many places. Wicked men are also referred to as "Satan", in some verses. See Acts 5:34; 1 Thessalonians 2:18; Matthew 16:23; 1 Timothy 1:20. Note:There are a few Bible passages that are commonly interpreted as teaching a supernatural devil, but in every case this is due to careless reading. For example, "Lucifer" of Isaiah 14:12 is not a wicked angel. He is the king of Babylon, a very wicked, cruel and proud man. Read the whole passage, starting from verse 4. Likewise, the "anointed cherub" of Ezekiel 28:14 is not a wicked angel. It is the king of Tyre - verse 12 says so.