The greatest attitude of all is gratitude.

People are more difficult to work with than machines. And when you break a person, he can't be fixed.

If you talk to a man in a language he understands, that goes to his head. If you talk to him in his language, that goes to his heart.

Are we happy that our grandchildren may never seen an elephant except in a picture book?

On the highest throne in the world, we still sit only on our own bottom.

A desire to be observed, considered, esteemed, praised, beloved, and admired by his fellows is one of the earliest as well as the keenest dispositions discovered in the heart of man.

Human nature is not totally fixed, but on any realistic scale, evolutionary processes are much too slow to affect it.

After your death you will be what you were before your birth.

Everyone has his own specific vocation or mission in life; everyone must carry out a concrete assignment that demands fulfillment. Therein he cannot be replaced, nor can his life be repeated, thus, everyone's task is unique as his specific opportunity to implement it.

There seems to be some perverse human characteristic that likes to make easy things difficult.

All sins are attempts to fill voids.

I can calculate the motion of heavenly bodies but not the madness of people.

Humanity is acquiring all the right technology for all the wrong reasons.

I just invent, then wait until man comes around to needing what I've invented.

Humans are not proud of their ancestors, and rarely invite them round to dinner.

There is no marvel in a woman learning to speak, but there would be in teaching her to hold her tongue.

How important it is for us to recognize and celebrate our heroes and she-roes!

Our true nationality is mankind.

A man sooner or later discovers that he is the master-gardener of his soul, the director of his life.

Every form of addiction is bad, no matter whether the narcotic be alcohol, morphine or idealism.

Human history is in essence a history of ideas.