A proverb teaching that harboring resentment harms one's own peace.
Hatred is a heavy burden that hurts the one carrying it
Chuki ni mzigo mzito humuumiza anayeubeba
"Samehe waliokukosea maana chuki ni mzigo mzito humuumiza anayeubeba."
Translation: Forgive those who wronged you because hatred is a heavy burden hurting its bearer.