Full Idea
If all we wanted was to maximise probability, we would never venture beyond our data.
Gist of Idea
To maximise probability, don't go beyond your data
Source
Peter Lipton (Inference to the Best Explanation (2nd) [2004], 07 'friends')
Book Reference
Lipton,Peter: 'Inference to the Best Explanation (2nd ed)' [Routledge 2004], p.110