The world would be happier if men had the same capacity to be silent that they have to speak.
I despise people who depend on these things [heroin and cocaine]. If you really want a mind-altering experience, look at a tree.
We are just an advanced breed of monkeys on a minor planet of a very average star. But we can understand the Universe. That makes us something very special.
To live alone is the fate of all great souls.
The first human who hurled an insult instead of a stone was the founder of civilization.
He that wrestles with us strengthens our nerves and sharpens our skill. Our antagonist is our helper.
Private passions tire and exhaust themselves, public ones never.
If you can't say something good about someone, sit right here by me.
The highest forms of understanding we can achieve are laughter and human compassion.
Challenging the meaning of life is the truest expression of the state of being human.
Human history is in essence a history of ideas.
Family not only need to consist of merely those whom we share blood, but also for those whom we'd give blood.
Are we happy that our grandchildren may never seen an elephant except in a picture book?
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.
Each man is questioned by life; and he can only answer to life by answering for his own life; to life he can only respond by being responsible.
A man's feet should be planted in his country, but his eyes should survey the world.
Humans are not proud of their ancestors, and rarely invite them round to dinner.
The whole universe is contained within a single human being – you.
Humanity is acquiring all the right technology for all the wrong reasons.
Sometimes our light goes out, but is blown again into instant flame by an encounter with another human being.
There is no come back to caves. We are too many.