if this be error and upon me proved,i never writ, nor no man ever loved
It's from a Shakespeare sonnet.
By the way, what is your question?
The line you're referring to is from William Shakespeare's play, Sonnet 116. It expresses a strong declaration of love, even in the face of potential errors or mistakes. Shakespeare is saying that if his belief in love turns out to be an illusion, then he never wrote anything, and no one has ever truly loved.
If you have a specific question about this line or would like further analysis, please let me know.