Can something become real if you say it a lot of times in your head?

Repetition can influence perception and belief, making ideas feel more real over time, a phenomenon often referred to as the "illusion of truth effect." However, simply thinking or saying something repeatedly does not change its objective reality. It may strengthen your conviction or motivation, but external validation and action are usually required to bring ideas into tangible existence. Ultimately, while thoughts can shape personal reality, they don't alter the facts of the external world.