Lewis Carroll quote about logic from Through the Looking-Glass - Contrariwise . . . if it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic.
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Contrariwise . . . if it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic.
 Lewis Carroll, Through the Looking-Glass (1871). copy citation

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Author Lewis Carroll
Source Through the Looking-Glass
Topic logic contradiction
Date 1871
Language English
Reference
Note
Weblink http://www.gutenberg.org/files/12/12-h/12-h.htm

Context

“Just then flew down a monstrous crow, As black as a tar-barrel; Which frightened both the heroes so, They quite forgot their quarrel.'
'I know what you're thinking about,' said Tweedledum: 'but it isn't so, nohow.'
'Contrariwise,' continued Tweedledee, 'if it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic.'
'I was thinking,' Alice said very politely, 'which is the best way out of this wood: it's getting so dark. Would you tell me, please?'
But the little men only looked at each other and grinned.
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