How Do Righteous People Still Sin?

What was the work Jesus had “finished” in John 17:4 if He hadn’t even died yet? How can we no longer be “sinful” (instead, righteous) if we still commit sins? I’ve had nagging doubts about my salvation for many years. What can I do?

Tags: assurance, born of God, doubts, finished, God's voice, growing, holy, Jesus, John 17:4, learning, new creation, new self, OCD, physical health, process, renewing of the mind, righteous, salvation, struggle, work