Concern for man and his fate must always form the chief interest of all technical endeavors. Never forget this in the midst of your diagrams and equations.

I am not only a pacifist but a militant pacifist. I am willing to fight for peace. Nothing will end war unless the people themselves refuse to go to war.

I cannot discover that anyone knows enough to say definitely what is and what is not possible. 

I will far rather see the race of man extinct than that we should become less than beasts by making the noblest of God's creation, woman, the object of our lust.

Never leave that till tomorrow which you can do today. 

No one would choose a friendless existence on condition of having all the other things in the world.

Science creates scientists...who creates godmen?

It gives me great pleasure indeed to see the stubbornness of an incorrigible nonconformist warmly acclaimed.

Books are indispensable. You can move from hard copies to soft copies. But that’s about it.

I deny the very existence of that Almighty Supreme Being.

No one saves us but ourselves. No one can and no one may. We ourselves must walk the path.

Time will not pause or tarry on his way, Today that seems so long, so strange, so bitter, Will soon be forgotten yesterday.