“Everyone sits in the prison of his own ideas; he must burst it open, and that in his youth, and so try to test his ideas on reality.”
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Source: Cosmic Religion: With Other Opinions and Aphorisms, 1931, p. 104
About this quote
Ideas become confining when they are protected from evidence and competing experience. Intellectual growth requires testing cherished beliefs early enough that identity is not built around never revising them.
When to use it
- A student designs an experiment that could disprove a favorite explanation rather than merely confirm it.
- A young founder interviews dissatisfied customers before becoming attached to the original product idea.
- A community debate asks participants to state what evidence would genuinely change their positions.