A Noble Lie ok?

What make a noble lie right? The way many of us was raised as a child, the adults always told us telling a lie is wrong and it was something we should not do. A child you learn from people and the things around you. You learn as a small baby to grow up and adapt to the world and society so, everything we do now is a learned trait programed into our minds to act, think, and learn a certain way. What make telling any lie right if it's anything but the truth. I know many of us heard growing up as a kid always tell the truth, the truth will set you free or, the saying tell the truth because when you lie you have to come up with another lie to cover the first lie and another lie to cover up that lie, and so on the cycle of lies just continues. How can telling a noble different from any other lie? The way that I think of it no matter what type of lie it is, it is not the truth. This will make me question the person who told the noble lie integrity. Why? because I was taught my whole life not to lie, however as I got older and became more self-depended without any parent influences I learn that it's okay to lie basically because it's a noble lie. What's the purpose of any lie? To cover up truth that you don't wont anyone to know. A lie is meant to be deceiving, so why would anyone wont to trust someone that is build up on deceiving people? What makes the people who tells noble lie more powerful than anyone else where they can do that and it be okay? Being that child that was told the truth will set you free, you would think society was built off truth, but then again as a child life is great and growing up in society you realize everything isn't as great as it seemed.