I just invent, then wait until man comes around to needing what I've invented.
Of mankind we may say in general they are fickle, hypocritical, and greedy of gain.
Ninety-nine percent of who you are is invisible and untouchable.
Example is not the main thing in influencing others. It is the only thing.
It was to carry the American democratic journey beyond these failings that Black citizens and civil rights workers risked unemployment, violence and death.
There are four million different kinds of animals and plants in the world. Thatís four million solutions to the problem of staying alive.
Sickness is mankind's greatest defect.
These are people who are capable of devotion, public devotion, to justice. They meant what they said and every day that passes, they mean it more.
One of the greatest diseases is to be nobody to anybody.
People demand freedom of speech as a compensation for the freedom of thought which they seldom use.
I despise people who depend on these things [heroin and cocaine]. If you really want a mind-altering experience, look at a tree.
Everywhere man blames nature and fate yet his fate is mostly but the echo of his character and passion, his mistakes and his weaknesses.
Are we happy that our grandchildren may never seen an elephant except in a picture book?
No mortal can keep a secret. If the lips are silent, he chatters with his fingertips; betrayal oozes out of him at every pore.
Our species needs, and deserves, a citizenry with minds wide awake and a basic understanding of how the world works.
The world would be happier if men had the same capacity to be silent that they have to speak.
We have to heal our wounded world. The chaos, despair, and senseless destruction we see today are a result of the alienation that people feel from each other and their environment.
In spite of everything, I still believe that people are really good at heart.
Human nature is not totally fixed, but on any realistic scale, evolutionary processes are much too slow to affect it.
He who makes a beast of himself gets rid of the pain of being a man.
That man is the noblest creature may also be inferred from the fact that no other creature has yet contested this claim.