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"Math is like going to the gym for your brain. It sharpens your mind."

"Momentum begets momentum, and the best way to start is to start."

"He who conquers himself is the mightiest warrior."

"See the positive possibilities. Redirect the substantial energy of your frustration and turn it into positive, effective, unstoppable determination."

“He who has a why to live can bear almost any how.”

“The eternal silence of these infinite spaces frightens me.”

“The question is not whether intelligent machines can have any emotions, but whether machines can be intelligent without any emotions.”

"The most terrifying thing is to accept oneself completely."