Quote
"Unless you perfectly understand the principle from which anyone acts, how should you know if he acts ill?"
"Plato said that virtue has no master [Republic 617e]. If a person does not honor this principle and rejoice in it, but is purchasable for money, he creates many masters for himself."

A principle may relate to a fundamental truth or proposition that serves as the foundation for a system of beliefs or behavior or a chain of reasoning. They provide a guide for behavior or evaluation. A principle can make values explicit, so they are expressed in the form of rules and standards. Principles unpack values so they can be more easily operationalized in policy statements and actions.
"Unless you perfectly understand the principle from which anyone acts, how should you know if he acts ill?"
"Our job in physics is to see things simply, to understand a great many complicated phenomena in a unified way, in terms of a few simple principles."
"If the ruling class thinks that by hanging us, hanging a few anarchists, they can crush out anarchy, they will be badly mistaken, because the anarchist loves his principles more than his life."
"[Many historians of morality,] Mostly Englishmen, … affirm some consensus of the nations, at least of the tame nations, concerning certain principles of morals, and then they infer from this that these principles must be unconditionally binding also for you and me; or, conversely, they see the truth that among different nations moral valuations are necessarily different and then infer from this that no morality is at all binding. Both procedures are equally childish."
"The man of action is always unprincipled; none but the contemplative has a conscience."
"A very important principle in investing is that you dont have to make it back the way you lost it. And, in fact, its usually a mistake to try and make it back it the way you lost it."