Othello
Shakespeare

"Put out the light, and then put out the light. (V ii 7)" Othello is referring to putting out the light of a candle. He uses this image to talk about killing Desdemona or extinguishing her "light." He continues saying that he can relight the candle but once he kills Desdemona he can't bring her back to life. At this point he is in their bedroom contemplating killing Desdemona. He is pretty sure he is going to do it but he is running through his reasons and finding his nerve before he does the deed. This metaphor gives the reader a hint that he still loves her. Othello is making sure he can live with what he is about to do. By saying he can't "light" her again after she is dead, he is strengthening his resolve. He knows that he will be hurting once she is dead and may want to have her back.