Love this quote from the Mark Cuban book;

I had to kick myself in the ass and recommit to getting up early, staying up late and consuming everything I possibly could to get an edge. I had to commit to making the effort to be as productive as I possibly could. It meant making sure that every hour of the day that I could contact a customer was selling time, and when customers were sleeping, 

I was doing things that prepared me to make more sales and to make my company better. And finally, I had to make sure I wasn’t lying to myself about how hard I was working. It would have been easy to judge effort by how many hours a day passed while I was at work. That’s the worst way to measure effort. Effort is measured by setting goals and getting results. What did I need to do to close this account? What did I need to do to win this segment of business? What did I need to do to understand this technology or that business better than anyone? What did I need to do to find an edge? Where does that edge come from, and how was I going to get there? The one requirement for success in our business lives is effort. Either you make the commitment to get results or you don’t.
How to Win at the Sport of Business: If I Can Do It, You Can Do It by Mark Cuban 

"Judge me for my own merits, or lack of them, but do not look upon me as a mere appendage to this great general or that great scholar, this star that shines at the court of France or that famed author. I am in my own right a whole person, responsible to myself alone for all that I am, all that I say, all that I do. it may be that there are metaphysicians and philosophers whose learning is greater than mine, although I have not met them. Yet, they are but frail humans, too, and have their faults; so, when I add the sum total of my graces, I confess I am inferior to no one."

Émilie du Châtelet

"I have come to the frightening conclusion that I am the decisive element. It is my personal approach that creates the climate. It is my daily mood that makes the weather. I possess tremendous power to make life miserable or joyous. I can be a tool of torture or an instrument of inspiration, I can humiliate or humor, hurt or heal. In all situations, it is my response that decides whether a crisis is escalated or de-escalated, and a person is humanized or de-humanized. If we treat people as they are, we make them worse. If we treat people as they ought to be, we help them become what they are capable of becoming." 

— Johann Wolfgang von Goethe

"One final paragraph of advice: do not burn yourselves out. Be as I am - a reluctant enthusiast....a part-time crusader, a half-hearted fanatic. Save the other half of yourselves and your lives for pleasure and adventure. It is not enough to fight for the land; it is even more important to enjoy it. While you can. While it’s still here. So get out there and hunt and fish and mess around with your friends, ramble out yonder and explore the forests, climb the mountains, bag the peaks, run the rivers, breathe deep of that yet sweet and lucid air, sit quietly for a while and contemplate the precious stillness, the lovely, mysterious, and awesome space. Enjoy yourselves, keep your brain in your head and your head firmly attached to the body, the body active and alive, and I promise you this much; I promise you this one sweet victory over our enemies, over those desk-bound men and women with their hearts in a safe deposit box, and their eyes hypnotized by desk calculators. I promise you this; You will outlive the bastards."
— Edward Abbey