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

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

Just as love is an orientation which refers to all objects and is incompatible with the restriction to one object, so is reason a human faculty which must embrace the whole of the world with which man is confronted.

In our enthusiasm to dominate nature and to produce more material good - goods - we have transformed means into ends.

Human history began with an act of disobedience and it is not unlikely that it will be terminated by an act of obedience.

A person who has not been completely alienated, who has remained sensitive and able to feel, who has not lost the sense of dignity, who is not yet 'for sale', who can still suffer over the suffering of others, who has not acquired fully the having mode of existence - briefly, a person who has remained a person and not become a thing - cannot help feeling lonely, powerless, isolated in present-day society.

When an individual is awake, almost all he does and says is inspired by the model of behavior that the society imposes,even without his being aware of it.