John Carmack

"The most important code you write is the code others can read and build upon."

"Wisdom is knowing when to push and when to pull back."

"The most important thing is to keep learning and to recognize that you don't know everything."

"Focus on what matters most and eliminate everything else that distracts you."

"Good code is its own best documentation. As you're about to add a comment, ask yourself, 'How can I improve the code so that this comment isn't needed?'"

"The speed of iteration is more important than the perfection of any single iteration."

"I think it's important to have a feedback loop, where you're constantly thinking about what you've done and how you could be doing it better."

"Technological advancement is an inherently iterative process."

"You can measure your worth by how many problems you solve."

"The difference between mediocrity and excellence is often just attention to detail."

"Ideas are easy. Implementation is hard."

"Always be willing to throw away code and start over if you realize there's a better way."

"The most important skill is learning how to learn effectively."

"Physics is really nothing more than a search for ultimate simplicity."

"You don't have to see the whole staircase, just take the first step."

"Optimization is the root of all evil in programming."

"The only way to learn is to do and to fail."

"Make it work, make it right, make it fast - in that order."

"Your brain is like a muscle - the more you use it, the stronger it gets."

"The worst code is code that almost works."

"I believe in focused, determined hard work."

"Mathematics is the language of the universe."

"Passion for what you do is essential for success."

"Every problem is an opportunity to learn something new."

"The simplest solution is usually the best one."

"You can't improve what you don't measure."

"Virtual reality is the ultimate empathy machine."

"Great things are done by a series of small things brought together."

"I think the most important thing for any creative person is to have discipline."

"The future belongs to those who believe in the beauty of their dreams."