„It is a capital mistake to theorise before one has data.“

— Arthur Conan Doyle
„It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts.“
— Arthur Conan Doyle
„Mistakes are always forgivable, if one has the courage to admit them.“
— Bruce Lee
„The folly of mistaking a paradox for a discovery, a metaphor for a proof, a torrent of verbiage for a spring of capital truths, and oneself for an oracle, is inborn in us.“
— Paul Valéry