Full Idea
If the law of contradiction itself were subjected to the test of coherence, we should find that, if we choose to suppose it false, nothing will any longer be incoherent with anything else.
Gist of Idea
If we suspend the law of contradiction, nothing will appear to be incoherent
Source
Bertrand Russell (Problems of Philosophy [1912], Ch.12)
Book Reference
Russell,Bertrand: 'The Problems of Philosophy' [OUP 1995], p.71
A Reaction
Russell is in error in treating coherence as if it was merely non-contradiction. If I see you as four feet tall today and six feet tall tomorrow, that is incoherent (to me) but not an actual contradiction. All accounts of truth need presuppositions.