This is the best time ever to make something. None of the greatest， coolest creations 20 years from now have been invented yet. You are not late.

"The principles of a free society are essential for human progress and prosperity."

The proper study of psychology is the prediction and control of behavior.

Literature is a healing, a comfort to the soul.

Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.

真正的勇气不是无所畏惧，而是面对恐惧依然前行。