John Carmack

"Technical excellence is not negotiable."

"Good artists copy, great artists steal - but they improve upon what they take."

"Quantify everything you possibly can."

"The only constant in technology is change."

"Your reputation is your most valuable asset."

"Intelligence is the ability to adapt to change."

"Most people overestimate what they can do in a year and underestimate what they can do in a decade."

"Consistent small improvements compound over time."

"The quality of your work is a direct reflection of your character."

"You should always be learning something new every single day."

"Perfectionism is the enemy of progress."

"Real understanding comes from doing, not from reading."

"The most valuable skill is the ability to solve problems."

"Innovation happens at the intersection of different ideas."

"There's no such thing as a stupid question, only stupid answers."

"The gap between knowing and doing is where most people fail."

"I've always believed that you should invest in people."

"Efficiency is doing things right; effectiveness is doing the right things."

"Your limitations are often just in your mind."

"The best way to predict the future is to invent it."

"Complexity is the enemy of excellence."

"You learn more from your failures than your successes."

"The most important investment you can make is in your own education."

"Passion without discipline is just noise."

"Every line of code is a decision."

"Time is your most valuable resource - use it wisely."

"The only way to do great work is to love what you do."

"Progress is made one step at a time, never all at once."

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

"The intersection of technology and humanity is where the magic happens."