Logic will get you from A to B. Imagination will take you everywhere.
Albert Einstein

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

Logic! Good gracious! What rubbish!
E. M. Forster

Against logic there is no armor like ignorance.
Laurence J. Peter

Logic teaches rules for presentation, not thinking.
Mason Cooley