"To me, fearless is not the absence of fear. It's not being completely unafraid. To me, fearless is having fears. Fearless is having doubts. Lots of them. To me, fearless is living in spite of those things that scare you to death."

"Imagination is the key to unlocking the world."

Success is when preparation meets opportunity.

数学是上帝用来书写宇宙的语言。