We forget that, although each of the liberties which have been won must be defended with utmost vigour, the problem of freedom is not only a quantitative one, but a qualitative one; that we not only have to preserve and increase the traditional freedom, but that we have to gain a new kind of freedom, one which enables us to realize our own individual self; to have faith in this self and in life.

The two most far-reaching critical theories at the beginning of the latest phase of industrial society were those of Marx and Freud. Marx showed the moving powers and the conflicts in the social-historical process. Freud aimed at the critical uncovering of the inner conflicts. Both worked for the liberation of man, even though Marx's concept was more comprehensive and less time-bound than Freud's.

To live is to be born every minute. Death occurs when birth stops.

The capacity to be puzzled is the premise of all creation, be it in art or in science.

I think [Karl] Marx, Pope John XXIII or Rosa Luxemburg [had achieved the mode of existence].But it would be useless to look at a list of illustrious names.

To love one person productively means to be related to his human core, to him as representing mankind. Love for one individual, in so far as it is divorced from love for man, can refer only to the superficial and to the accidental; of necessity it remains shallow.

Man can only know the nagation, never the position of ultimate reality.