I recently encountered a person who believed in complete sanctificationism-- the belief that Christians can become sinless. The classic proof text he used was 1 John 3:9 and 1 John 5:18. I have consulted different commentaries in which disagreements arise surrounding "poiei." Does it denote an absolute action or a continual action? Is John only refering to the regenerate aspect of our nature or the overall aspect? One thing is for sure; this verse is not espousing the heretical doctrine of complete sanctificationism.