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.
Charles Lutwidge Dodgson, better known as Lewis Carroll is an English writer that was born on 27 January 1832 in Daresbury, Cheshire, England and died of pneumonia at the age of 65 on 14 January 1898 in Guildford, Surrey, England. His most famous writing is Alice's Adventures in Wonderland.
This quote is from Chapter 4: Tweedledum and Tweedledee and was said by Tweedledee.