Sin always lays dormant in the flesh, until the Word of God exposes it, and then it (sin) revives back to life. No one can disguise sin in the presence of the Word of God.Galatians 5:19–21, This is how the sin nature lets the world know that it (nature-spirit) exists.
What this means is "nature spirit" cannot be seen, heard, touched, tasted, or smelled but we know that it exists through its manifestations, first Corinthians 2:9–12.
It is a natural thing for degenerate man to manifest the works of the flesh as described in the above verses, Romans 1:28.
The works of the flesh are the result of a reprobate mind that is totally compatible with the sin nature in degenerate mankind. However, mankind has learned to control or disguise the fruit of the sin nature so individuals will be acceptable to each other.
Rom 7:9.. I was once alive apart from the law, but when the commandment came, sin came alive and I died.