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They are forced to either,
1. Keep them unknown
2. Hide them
3. Ignore them, and thus be blinded to them.
which turns them to hypocrites, and self righteous people. they look at their spiritual lives as compared to sinners, and not to Gods law. You will see most of them judge certain sins, and say I do not do those things, So I must be righteous, which is why they come off as they do.
not realizing God has justified us, we seek to justify ourselves.
i am also guilty of this at times.