Ask for forgiveness, forgive others, forgive ourselves. Move on. Strive to be better. Failing, forgive again and strive again.
The prayer in the poster is Buddhist but forgiveness is pretty much the essence of Christianity. In the Gospels Jesus drives this message home time after time:
“Forgive us trespasses as we forgive those who trespass against us.”
“And to him who strikes you on your cheek, offer the other, and from whoever takes away your cloak, withhold not your coat also.”
“Let any one of you who is without sin be the first to throw a stone at her.”
“Judge not, that ye be not judged. For with what judgement ye judge, ye shall be judged: and with what measure ye mete, it shall be measured to you.”
“Father, forgive them; for they do not know what they are doing.”
Then Peter came and said to Him, “Lord, how often shall my brother sin against me and I forgive him? Up to seven times?” Jesus said to him, “I do not say to you, up to seven times, but up to seventy times seven.