Principles are ways of successfully dealing with reality to get what you want out of life.
Ray Dalio, one of the world’s most successful investors and entrepreneurs, cites principles as his key to success.
An above-the-line conversation addresses the main points and a below-the-line conversation focuses on the sub-points. When a line of reasoning is jumbled and confusing, it's often because the speaker has gotten caught up in below-the-line details without connecting them back to the major points. An above-the-line discourse should progress in an orderly and accurate way to its conclusion, only going below the line when it's necessary to illustrate something about one of the major points.