38. "...if you do not forgive others..." (Matthew 6:14-15)

“'For if you forgive others for their transgressions, your heavenly Father will also forgive you. But if you do not forgive others, then your Father will not forgive your transgressions'" (Matthew 6:14-15).

Forgiveness is hard work. Is the command to forgive others unilateral? How do we avoid bitterness when we've been sinned against? How is forgiveness weaponized?