Let me tell you, that I read many books related to success and most of them are focused on undeniable qualities like single-mindedness, hard work, knowledge, intelligence, talents, endurance, straightforwardness, desire, passion, decision, diligence, patience… that is as true as the law of gravity is; but what they failed to outline is that the master key that governs all these qualities can be summed up in one word: Self-mastery. It is the foundation on which all these qualities rest, because they can all be built through self-mastery. How can you explain the fact that some people were able to endure hardship more than others until they became successful? Because they knew how to master themselves until they achieved their purpose.