It is easy to hate and it is difficult to love. This is how the whole scheme of things works. All good things are difficult to achieve; and bad things are very easy to get.

I was taught that the way of progress was neither swift nor easy.

There's a silly notion that failure's not an option at NASA. Failure is an option here. If things are not failing, you are not innovating enough.

It is better to be violent, if there is violence in our hearts, than to put on the cloak of nonviolence to cover impotence.

Everything that irritates us about others can lead us to an understanding of ourselves.