This quote from page 8 of John Hawke's Fortune by G. A. Henty is one of my favorites:
"Never do a dishonourable action, be honest and straightforward, above all never tell a lie; were you to do so, putting aside the sin and shame of it, it would brand you as a coward. Cowardice is the father of lying; a brave boy is not afraid of punishment for a fault that he has committed, but owns up to the truth and takes his punishment as a consequence of it, but the coward lies in hopes of escaping the penalty. I don't know what your course in life will be, it is out of my power to aid you, and you have to fight your own way; but fight fair always, there is no disgrace in honest work, whatever it may be."
If any of my readers have any favorite Henty quotes, please post them in the comment section!