But they say if you dream a thing more than once, it's sure to come true.

The line expresses a folk belief that recurring dreams carry a kind of inevitability—what returns to the mind repeatedly is destined to materialize. In popular usage it functions as encouragement: persistent imagining (or longing) can be a prelude to real-world fulfillment. Even if taken metaphorically rather than literally, it suggests that repeated dreams reveal deep desires and can motivate action, turning aspiration into outcome. The sentiment aligns with the broader “dreams come true” ethos often associated with Disney, though the phrasing itself reads like a character’s dialogue rather than a personal maxim.