Science progresses best when observations force us to alter our preconceptions. Vera Rubin
"Truth” is contained in the preconceptions of him who seeks to define it. Any organization of ideas whatever presupposes a judgment on the world. Jack Vance
I've told you before. You shouldn't judge people based on appearances and your preconceptions. Masashi Kishimoto
If theater is ritual, then dance is too... It's as if the threads connecting us to the rest of the world were washed clean of preconceptions and fears. When you dance, you can enjoy the luxury of being you. Paulo Coelho
Go ahead. Go right ahead. Don't let me discourage you. Any objections from me would simply confirm your preconceptions. Robert A. Heinlein
"You want me to tell you why reality is the way it is,” Seethwright said. "But there is no explanation for that. You must simply learn to fit your preconceptions to what you find. You must not expect reality to adapt itself to you, except very infrequently. Robert Sheckley