If you get an idea for a hub from a comment another hubber wrote, you shouldn't copy it (or other comments) verbatim. Instead, decide how you want to slant and present your article, essay, story (whatever format you choose) and use your own words to write it. If it's an article, you will need to do research, which will give you a lot more material with which to work. If an essay or fiction, you should consider the other hubber's comment merely the seed or 'starter' for your own hub. Never copy another's writing and use it as your own. Instead, use only the idea it sparked and make it your own through your unique writing style and voice. Good luck!