Let me explain. The happiest man on earth would be able to use the Mirror of Erised like a normal mirror, that is, he would look into it and see himself exactly as he is. [...] It shows us nothing more or less than the deepest, most desperate desire of our hearts. [...] However, this mirror will give us neither knowledge or truth. Men have wasted away before it, entranced by what they have seen, or been driven mad, not knowing if what it shows is real or even possible. [...] It does not do to dwell on dreams and forget to live, remember that.