Mark 11:25-26

Whenever you stand praying, if you have anything against anyone, forgive him (drop the issue, let it go), so that your Father who is in heaven will also forgive you your transgressions and wrongdoings (against Him and others). (But if you do not forgive, neither will the Father in heaven forgive your transgressions).

Unforgiveness can be a roadblock to getting our prayers answered and stop us from living in peace. Unforgiveness is like the pebble that we need to shake out of a shoe. The pebble is a constant irritant that only we can remove, and we can’t move freely and live in peace in life until we do.