In my experience, the best creative work is never done when one is unhappy.

Creativity is intelligence having fun

It is the theory that decides what can be observed.

Problems cannot be solved by the same level of thinking that created them.

I cannot imagine a God who rewards and punishes the objects of his creation [and] is but a reflection of human frailty.

It is, in fact, nothing short of a miracle that the modern methods of instruction have not yet entirely strangled the holy curiosity of inquiry; for this delicate little plant, aside from stimulation, stands mainly in need of freedom. Without this it goes to wrack and ruin without fail.