Reading your essay in a tutorial, is like fighting a war in the trenches. Sentence by sentence, you have to be prepared to defend yourself, every move you make. Meter by meter you have to be prepared to face fire from your enemy.
Eventually the war is won. The sentences have been defended, but just as in a war there have been casualties along the way. Some sentences, you realise, have just been put in there early in the morning for no reason, and they have to go. The victory is overwhelming though. It was a tough fight.