right and wrong?

we have always been told to be honest in whatever we say. we have always been told that"honesty is the best policy". but is that really true? sometimes i see people achieving what they want using dishonesty. they achieve success faster than a person who uses honesty..i sometimes ask myself would i deceive my friend into believing her painting is good even though it isint?..so, all these moral rules we learn maybe right as a rule but they can be harsh when they are applied sometimes.
morals and ethics can never be distinguished as right and wrong.one can not say whether honesty is a good thing or bad. it differs from person to person. a robber can deceive someone into believing he is some one he is not and rob all the money. he used deception and dishonesty to get what he wanted. there is nothing wrong in this. he made a conscious effort to achieve it. the only reason people think it is wrong is because they compare themselves to the robber. they make themselves believe that they would never steal. they would use better ways to get the money they want. so at the moment, when they hear about the theft they will immediately call the police and get the thief arrested for his wrong doing. but maybe later when they really need the money and they have no option other than robbery, they might steal it.
hence no one can say what is right and what is wrong. it all depends on what you believe. if i believe stealing is wrong, i must stick to that and no stop any one else fro doing what they think is right.