The opening of Elements of Statistical Learning by Trevor Hastie, Robert Tibshirani and Jerome Friedma:
In God we trust, all others bring data.
–William Edwards Deming (1900-1993)
[footnote]On the Web, this quote has been widely attributed to both Deming and Robert W. Hayden; however Professor Hayden told us that he can claim no credit for this quote, and ironically we could find no “data” confirming that Deming actually said this.
