Do not think that what is hard for you to master is humanly impossible; and if it is humanly possible, consider it to be within your reach. — MARCUS … - Robert Greene

Some 2,600 years ago the ancient Greek poet Pindar wrote, “Become who you are by learning who you are.” What he meant is the following: You are born with a particular makeup and tendencies that mark you as a piece of fate. It is who you are to the core. Some people never become who they are; they stop trusting in themselves; they conform to the tastes of others, and they end up wearing a mask that hides their true nature. If you allow yourself to learn who you really are by paying attention to that voice and force within you, then you can become what you were fated to become — an individual, a Master.

Never whine, never complain, never try to justify yourself.

[M]any believe that by being honest and open they are winning people’s hearts and showing their good nature.They are greatly deluded. Honesty is actually a blunt instrument, which bloodies more than it cuts. Your honesty is likely to offend people; it is much more prudent to tailor your words, telling people what they want to hear rather than the coarse and ugly truth of what you feel or think. More important, by being unabashedly open you make yourself so predictable and familiar that it is almost impossible to respect or fear you, and power will not accrue to a person who cannot inspire such emotions.