"You will never be greater than the thoughts that dominate your mind." http://tinyurl.com/6l2sj3b

If it’s true that you become what you think about most, it follows that the quantity and quality of success you achieve in your life will be in direct proportion to the size of your thoughts. If you allow your mind to be dominated by trivial matters, your achievements are likely to be unimportant. Discipline yourself to think about important things. Keep up with what’s new in your field and with what’s going on in the world. Make a list of good ideas that you can use anytime you are searching for a creative solution to a problem. Remember, small minds think about things; great minds think about ideas.