Stuff your eyes with wonder... live as if you'd drop dead in ten seconds. See the world. It's more fantastic than any dream made or paid for in factories.
We traced this quote to a primary published source and confirmed the words are genuinely the author's. You can cite it with confidence.
The wording that circulates online typically drops the dialogue tag and the closing two sentences, condensing the passage to "Stuff your eyes with wonder, live as if you'd drop dead in ten seconds." This shortened form is a faithful compression rather than an alteration, but it is not the text as published.
Attribution to Bradbury is correct in the authorial sense: he wrote the passage. The sentiment is voiced by a character recalling another character, which is worth noting for readers who encounter the line presented as Bradbury speaking in his own voice.