Full Idea
The only way to be sure we have the best explanation is to investigate the alternatives and see if they are any better.
Gist of Idea
To see if an explanation is the best, it is necessary to investigate the alternative explanations
Source
J Baggini / PS Fosl (The Philosopher's Toolkit [2003], §3.01)
Book Reference
Baggini,J and Fosl,P.S.: 'The Philosopher's Toolkit' [Blackwells 2003], p.66
A Reaction
Unavoidable! Since I love 'best explanation', I now seem to be committed to investigation every mad theory that comes up, just in case it is better. I hope I am allowed to reject after a very quick sniff.