In a single statement,
the Bible sums up all anyone needs to know about ethical behaviour.
DO UNTO OTHERS AS YOU WOULD HAVE THEM DO UNTO YOU.

"If I'm willing to cheat, I could have a competitive advantage in playing golf.
But it's not the same game.
If we define the purpose of living only as an accomplishment
of a particular task, accomplishing the task becomes the moral imperative....
winning the election, getting the scoop, making a profit.
But we know that nobody on a deathbed says,
'I wish I had spent more time at the office.'
People's values begin to change when they reflect upon how futile
most of the flurry of activity was.
And the fact of the matter is that a good conscience is the best pillow.
Living a good life is the most important thing for us." Michael Josephson

"More hideous crimes have been committed
in the name of obedience than in the name of rebellion.
C.P. Snow

"I love the fact that teenagers express all the emotion we adults
have learned to surpress.
When they are excited or depressed about something,
they are not coy about their feelings.
I love their earnest passions, the urgency of their relationships,
their capacity for outrage.
Upon discovering an injustice, they demand in disbelief,
"Why isn't anyone doing anything about that?"
Teenagers insist that we question our motives,
our rules for them, our own behaviour.
They keep us honest." Letty Cottin Pogrebin

"The one thing that doesn't abide by majority rule
is a person's conscience." Harper Lee

"This above all: 'To thy own self be true.'
And it must follow, as the night, the day,
Thou canst not be false to any man."
William Shakespeare

The Hippocratic Oath

"I swear by Apollo the healer,
invoking all the gods and goddesses to be my witness,
that I will fulfil this oath and this written covenant
to the best of my ability and judgement.
I will look upon him who has taught me this art
as one of my own parents.
I will share my substance with him,
and I will supply his necessities if he be in need.
I will regard his offspring even as my own brethren,
and I will teach them this art,
if they would learn it, without fee or covenant.
I will impart this art by precept,
by lecture and by every mode of teaching,
not only to my own sons but to the sons of him who has taught me
and to disciples bound by the covenant and oath,
according to the Laws of Medicine.
The regimen I adopt shall be for the benefit of the patient
according to my ability and judgement,
and not for their hurt or for any wrong.
I will give no deadly drug to any, though it be asked of me,
nor will I counsel such, and especially I will not aid a woman to procure abortion.
Whatsoever house I enter, there will I go for the benefit of the sick,
refraining from all wrongdoing or corruption,
and especially from any act of seduction of male or female,
of bond or free.
Whatsoever things I see or hear concerning the life of men,
in my attendance on the sick or even apart therefrom,
which ought not to be noised abroad, I will keep silence thereon,
counting such things to be as sacred secrets.
Pure and holy will I keep my life and my art."