People 'err' or 'commit error', but the ability to forgive comes only from God.

人非圣贤，孰能无过。No one is perfect.人无完人。

The verb "err" means to do something wrong; to make a mistake is "to err". "To err is human" because all people ("humans") make mistakes. "To err is human, to forgive divine" says we should try hard to forgive others because all people are human and make mistakes. Example: "I am still angry about what my manager did yesterday!" Answer: "It is best to just let it go; to err is human, to forgive divine." The world of people is "human" and the world of God is "divine". God's special power to forgive people for their mistakes is called "divine" mercy. When we forgive other people we are acting "divine". "To err is human, to forgive divine" says that we are all human and we all make mistakes so we should all try hard to forgive other people when they make mistakes. Example: "I will never forgive my mother for what she has done!" Answer: "Don't be angry at her. To err is human, to forgive divine." (Because we use the word "is" in the first phrase "to err is human" we do not use "is" again in the second phrase: "to forgive divine".) We are all people who make mistakes so to forgive others when they make mistakes is the right thing to do; "to err is human, to forgive divine."

People often say that “人非圣贤，孰能无过”

To err is to make a mistake. To make a mistake is human. People will make mistakes at some stage in their lives. If you make a mistake you are simply experiencing one of the things humans are prone to. So when people do the wrong thing we should try hard to forgive them just as God forgave mankind. 'To err is human; to forgive, divine'. This is a quote from an English poet called Alexander Pope .