Jesus spoke the parable of the Unforgiving Servant (Mt. 18:23-35) by saying: "Therefore the kingdom of heaven may be compared to a king who wished to settle accounts with his servants (v.23).
Does the Parable imply "not forgiving our brothers from our heart" have a bearing on entering into the Kingdom of Heaven?
Could Verse 34b - "until he should pay all his debt" be a clue?
Text: Matt. 18:34-35 (ESV)
34 And in anger his master delivered him to the jailers, until he should pay all his debt. 35 So also my heavenly Father will do to every one of you, if you do not forgive your brother from your heart