(1 John 1:7).
Some people falsely think that those who claim to walk in the light, are always perfect. But according to the context of the above passage (1 John 1:5-10), that is actually the definition of walking in darkness. Only those who walk in darkness claim to be without sin (1 John 1:8).
Rather walking in God's light means being authentic. It means being genuine. It means agreeing with God that we have flaws and giving Him permission to change us (1 John 1:9).
The only light we have to offer this dark world is God's light as it shines through us. It turns out; those who walk in God's light are a lot like ancient stained glass windows. When you look closely you will see some flaws and imperfects, yet they are stunningly glorious when the light of the Son shines through.