1 John 1:6; 1 John 1:8

1 John 1:6

6 If we claim that we experience a shared life with him and continue to stumble around in the dark, we're obviously lying through our teeth - we're not living what we claim.

1 John 1:8

8 If we claim that we're free of sin, we're only fooling ourselves. A claim like that is errant nonsense.