1 John 1:7 But if we walk in the light as He is in the light, we have fellowship with one another, and the blood of Jesus Christ His Son cleanses us from all sin.
So, here is the opposite of practicing sin. Walking in the light, or practicing Gods truths in our lives. Its a life of being washed in His word, being honest about our sins that we have committed thus the cleansing of Jesus' blood over all our sin. How freeing to walk with God as our sin is cleansed. The man claiming to be perfect does not have fellowship with God. For its when we are in His presence, we are made aware of our imperfections, never unto condemnation, but to be made right, freed, set free, and receive fullness of His joy.