God's eternal nature is truth and sin is what is against His eternal nature. God's law divides between what is in accordance with or contrary to God's nature, which is why God's law is truth (Psalms 119:142) and why it is by God's law that we have knowledge of sin (Romans 3:20). The Son is the exact image of God's nature (Hebrews 1:3), so he is the embodiment of the truth (John 14:6) and he came into the world to testify about the truth (John 18:37), which he did by teaching how to experience God's nature in obedience to His law by word and by example (Matthew 4:15-23, 1 Peter 2:21-22). The Spirit has the role of leading us in truth (John 16:13) because the fruits of the Spirit are aspects of God's nature, which is why the Spirit has the role of leading us to obey God's law (Ezekiel 36:26-27) and the role of convicting us of sin (John 16:8), which is the transgression of God's law (1 John 3:4). Our salvation is from the experience of sin (Matthew 1:21), which is God our Savior desires all people to be saved and experience truth (1 Timothy 2:3-4), which is the gift of experiencing God's nature through obeying His law. The extent to which people are in opposition to obeying God's law is the extent to which they have minds set on the flesh and are enemies of God in opposition to walking in the Spirit of truth (Romans 8:4-7).