You’ll get 10x better results by elevating good behavior rather than punishing bad behavior， especially in children and animals.

"Courage is not the absence of fear, but the triumph over it."

Every mathematical problem has a solution; you just need to find the right perspective.

The only way to learn mathematics is to do mathematics.

The truth is always complicated, and it’s rarely pure.

"There are no hard distinctions between what is real and what is unreal, nor between what is true and what is false."