To err is ...... to forgive divine.

To err is human; to forgive divine.
This famous quote suggests that making mistakes is a characteristic of being human, emphasizing the fallibility of human nature. The phrase "to err is human" acknowledges that making errors or mistakes is a natural aspect of being human, highlighting our imperfections and limitations. Therefore, "human" is the most appropriate choice to complete the sentence, conveying the idea that making mistakes is a common trait among people.