Each success only buys an admission ticket to a more difficult problem.
Energy and persistence conquer all things.
The greatest test of courage on earth is to bear defeat without losing heart.
I never worry about action, but only about inaction.
Don't be afraid to give your best to what seemingly are small jobs. Every time you conquer one it makes you that much stronger.
Remember the difference between a boss and a leader: a boss says, "Go!" – a leader says, "Let's go!"
Let's go invent tomorrow instead of wondering about what happened yesterday.