Live with purpose. Don't let people or things around you get you down.
Condemnation before investigation is the highest form of ignorance.
It's not that I'm so smart.
There is possibility in every difficulty.
It is every man's obligation to put back into the world at least the equivalent of what he takes out of it.
Often in evolutionary processes a species must adapt to new conditions in order to survive. Today the atomic bomb has altered profoundly the nature of the world as we know it, and the human race consequently finds itself in a new habitat to which it must adapt its thinking.