To the early Christians, Jesus really saw and Jesus really knew. And as usual, Jesus didn't waste words. If He issued a grave warning, it was because He meant it. If He offered the opportunity to repent, it was also because He meant it.
Search me, O God, and know my heart; try me and know my anxious thoughts; and see if there be any hurtful way in me, and lead me in the everlasting way. - Psalm 139:23-24