Erich Fromm
Happiness is the indication that man has found the answer to the problem of human existence the productive realization of his potentialities and thus, simultaneously, being one with the world and preserving the integrity of his self.
Knowing means to penetrate through the surface, in order to arrive at the roots, and hence the causes, knowing means to "see" reality in its nakedness. Knowing does not mean to be in the possession of the truth , it means to penetrate the surface and to strive critically and actively in order to approach truth ever more closely.
Ideas become powerful only if they appear in the flesh , an idea which does not lead to action by the individual and by groups remains at best a paragraph or a footnote in a book -- provided the idea is original and relevant. It is like a seed stored in a dry place. If the idea is to have influence, it must be put into the soil, and the soil is people and groups of people.
Not he who has much is rich, but he who gives much.
Love is an act of faith, and whoever is of little faith is also of little love.
Immature love says, I love you because I need you. Mature love says, I need you because I love you.
Love is the only sane and satisfactory answer to the problem of human existence.