In wartime, truth is so precious that she should always be attended by a bodyguard of lies.
Nothing in life is so exhilarating as to be shot at without result.
Ethical axioms are found and tested not very differently from the axioms of science. Truth is what stands the test of experience.
Everything you are against weakens you. Everything you are for empowers you.
Difficulties are meant to rouse, not discourage. The human spirit is to grow strong by conflict.
— William Ellery Channing
I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.
Tell the innocent visitor from another world that two people were killed at Serajevo, and that the best that Europe could do about it was to kill eleven million more.
Perhaps the main motive behind my isolation was my desire to escape from the demands of relationships, which I consider very difficult in comparison to making rockets. All I desired was to be true to my way of life, to uphold the science of rocketry in my country and to retire with a clean conscience.
We have not invaded anyone. We have not conquered anyone. We have not grabbed their land, their culture, their history and tried to enforce our way of life on them.