God's Child or Bastard Child?

Hebrews 12:7-9 "…7 Endure suffering as discipline; God is treating you as sons. For what son is not disciplined by his father? 8 If you do not experience discipline like everyone else, then you are illegitimate children and not true sons. 9 Furthermore, we have all had earthly fathers who disciplined us, and we respected them. Should we not much more submit to the Father of our spirits and live?…"

There are those who boast that they must be good because they are not disciplined by God. They are the ones to worry about.