Specialize in your particular field and try to know more about it than anyone else.
The only path by which another person can upset you is through your own thought.
As you sow in your subconscious mind, so shall you reap in your body and environment.
Your desire is your prayer.
You are like a captain navigating a ship... You must give the right orders, thoughts and images to your subconscious which controls and governs all your experiences.
Trying to accumulate wealth by the sweat of your brow and hard labor is one way to become the richest man in the graveyard. You do not have to strive or slave hard.