Hello Misaki, Making mistakes is part of being human, every single person is fallible and bound to make mistakes. People on the other hand can hardly forgive, because forgiveness is a trait of God as God is seen as being merciful. That is why managing to forgive people is not easy,but we should try to do that. It means also, since we all make mistakes then forgiving others when they err ,is the right thing to do.

人非圣贤谁能无过，去原谅它，是圣洁的事。