“This is the final test of a gentleman: his respect for those who can be of no possible service to him.” William Phelps

Respect your elders. Today, young men go around acting as if they
know everything. They don’t. Treat those who have gone on before
you with respect and you’ll be rewarded with the wisdom they have
gained during life.
Always be punctual. Make it a rule to arrive on time to any
engagement. Better yet, arrive a few minutes early. Such a habit
ensures composure and ease which is the very essence of
gentlemanly deportment.
Apologize quickly and sincerely. When you have committed a fault,
apologize quickly. Denying or delaying an apology in order to show
you have “principle” only shows that you’re petty and not a
gentleman.
Accept apologies given to you. No matter how great the offense, a
gentleman should not keep his anger after an apology has been
made.
Do not laugh at others’ mistakes. The person who errs in public is
already embarrassed enough. They don’t need you ridiculing them
in public.
Avoid inside jokes. It is rude to make remarks in general company
that are only intelligible to one person.
Don’t flaunt your riches. Modesty is a sign of a true gentleman. A
cad must draw attention to his wealth in order to validate his
sense of worth. A gentleman knows he is successful without having
to let others know about his success.
Use kind words. Today’s world seems to reward cynicism and
putdowns. A gentleman rises above such pettiness and says only
uplifting and edifying things.
Don’t spit. Many men do this without thinking about it. If you are
not on the baseball diamond, avoid spitting. It is just plain uncouth.