Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws.
Plato
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin
Peace if possible, truth at all costs.
Martin Luther
Honesty is the best policy.
Start with what is right rather than what is acceptable.
Franz Kafka
When I do good I feel good, when I do bad I feel bad, and that's my religion.
Abraham Lincoln
What is right is not always popular and what is popular is not always right.
Albert Einstein
Therefore, the good of man must be the end of the science of politics.
Aristotle
Never let your sense of morals prevent you from doing what is right.
Isaac Asimov
Knowledge of what is does not open the door directly to what should be.
It is my conviction that killing under the cloak of war is nothing but an act of murder.
Can anything be stupider than that a man has the right to kill me because he lives on the other side of a river and his ruler has a quarrel with mine, though I have not quarrelled with him?
Blaise Pascal
Force always attracts men of low morality.
