'I am one who loved not wisely but too well' is a quotation from?

I am one who loved not wisely but too well" is a famous quotation from William Shakespeare's play, Othello.

The line is spoken by Othello himself in the final act of the play, after he has killed his wife Desdemona based on the false accusations of Iago. He realizes his tragic error and utters these words as a part of his final speech before taking his own life.