Happiness does not exclude sadness - if a person responds to life, he's sometimes happy and sometimes sad. What matters is he responds.

There are many who feel consciously hopeful and unconsciously hopeless, and there are few for whom it is the other way around.

While every human being has a capacity for love, its realization is one of the most difficult achievements.

Boredom is nothing but the experience of a paralysis of our productive powers.

If there is no evidence that sport lowers aggression, at the same time it should be said that there is also no evidence that sport is motivated by aggression.

To love somebody is not just a strong feeling - it is a decision, it is a judgment, it is a promise.

The revolutionary and critical thinker is in a certain way always outside of his society while of course he is at the same time also in it.