Walking in the Light Cannot Mean Sinlessness

How we walk testifies to whether we really have a relationship with god. We know that we are not justified by works, but wea so know that our works confirm our justification. So how do we enjoy the assurance of our salvation when our holiness remains imperfect? Let me just point to one passage of scripture that is so important,. and i pray that we will all ger over it long enough to let it have its good assurance giving effect.