The behaviour of an individual can be understood only in terms of the behavior of the whole social group of which he is a member, since his individual acts are involved in larger, social acts which go beyond himself and which implicate the other members of that group.
If in this moment I were to go mad, my madness would consist of sitting always with my eyes staring, my mouth open, and my hands between my knees, without laughing or crying, or even moving except for sheer necessity. I haven't the least urge to conceive a desire, not even for death. . . . This is the first time that noia [boredom or spleen] not only presses and tires me but harries and rips like the sharpest pain.
We human beings are social beings. We come into the world as the result of others’ actions. We survive here in dependence on others. Whether we like it or not, there is hardly a moment of our lives when we do not benefit from others’ activities. For this reason, it is hardly surprising that most of our happiness arises in the context of our relationships with others.
The artist . . . can leave a great many of the most fundamental aspects of culture to be picked up not from his actual words, but from his emphasis. [He can] group and stress [words] so that the reader almost unconsciously receives information which is not explicit in the sentences and which the artist would find it hard - almost impossible - to express in analytic terms. This impressionistic technique is utterly foreign to the methods of science.
If you analyze well your most poetic impressions and imaginings -- the ones that most exalt you and pull you outside of yourself and of the real world -- you would find that they and the pleasure they cause (at least after childhood) consist totally or chiefly in remembrance.
Cognitive psychology tells us that the unaided human mind is vulnerable to many fallacies and illusions because of its reliance on its memory for vivid anecdotes rather than systematic statistics.
The older I grow, the more I realize how terribly difficult it is for people to understand each other, and I think that what misleads one is the fact that they all look so much like each other. If some people looked like elephants and others like cats, or fish, one wouldn’t expect them to understand each other and things would look much more like what they really are.
Dixxit 
