When a man is overcome by anger, he has a poisoned fever. He loses his strength, he loses his power over himself and over others. He throws away time in which he might have gained the end he desires. The is no time for anger in the world. - The Ancient One ↗
I know from personal experience how damaging it can be to live with bitterness and unforgiveness. I like to say it's like taking poison and hoping your enemy will die. And it really is that harmful to us to live this way. ↗