If you are doing GCSE english lit, you should remember quotes that are memorable enough for you to instantly think oh yes this analysis. Once you think of that analysis either see if you can expand on it or look for an alternative analysis. For me, once I get started, I try not to stop writing for longer than 3-5 seconds to think because I lose the writing flow so I try think whilst writing, perhaps giving myself 2-3 seconds to collect my thoughts just for that quote. If you can not write in detail for that quote, move on because you will lose more marks just trying to have 1 good quote with explanation than 2 quotes with 1 good explanation and 1 not so good explanation