Full Idea
The law of contradiction is not a 'law of thought' ..because it is a belief about things, not only about thoughts.
Gist of Idea
The law of contradiction is not a 'law of thought', but a belief about things
Source
Bertrand Russell (Problems of Philosophy [1912], Ch. 9)
Book Reference
Russell,Bertrand: 'The Problems of Philosophy' [OUP 1995], p.50
A Reaction
The principle is a commitment about things, but it is inconceivable that any experience, no matter how weird, could ever contradict it. It would be better to assume that we had gone insane, than that a contradiction had occurred in the world.