Empirical Model Building and Response Surfaces (1987) [with N. R. Draper] - Box, George E. P. | WIST Quotations
Essentially, all models are wrong, but some are useful. As written on p. 424; earlier in the book (p. 74), it is given as: "Remember that all models are wrong; the practical question is how wrong do they have to be to not be useful."
