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I'm not going to give you an example of an essay but an example is the difference between saying you love someone and then actually using actions to show that you do, because saying it doesn't really mean anything but what you do to back it up is more important.

Or if you are a student and you're failing, but you say you're trying to learn and study. You can say whatever you want but in the end only your actions will reflect the truth about whether you actually did or not.