But the less a man knows about the past and the present the more insecure must prove to be his judgment of the future.

It is no wonder if, under the pressure of these possibilities of suffering, men are accustomed to moderate their claims to happiness - just as the pleasure principle itself, indeed, under the influence of the external world, changed into the more modest reality principle -, if a man thinks himself happy merely to have escaped unhappiness or to have survived his suffering, and if in general the task of avoiding suffering pushes that of obtaining pleasure into the background.

The fateful question for the human species seems to me to be whether and to what extent their cultural development will succeed in mastering the disturbance of their communal life by the human instinct of aggression and self-destruction ... One thing only do I know for certain and that is that man's judgements of value follow directly from his wihes for happiness-that, accordingly, they are an attempt to support his illusions with arguments.

If all the evidence put forward for the authenticity of religious teachings originates in the past, it is natural to look round and see whether the present, about which it is easier to form judgements, may not also be able to furnish evidence of the sort. If by this means we could succeed in clearing even a single portion of the religious system from doubt, the whole of it would gain enormously in credibility.

Obsessional prohibitions are extremely liable to displacement. They extend from one object to another along whatever paths the context may provide, and this new object then becomes, to use the apt expression of one of my women patients, 'impossible' - till at last the whole world lies under an embargo of 'impossibility'.

Nature delights in making use of the same forms in the most various biological connections: as it does, for instance, in the appearance of branch-like structures both in coral and in plants, and indeed in some forms of crystal and in certain chemical precipitates.

The intention that man should be happy is not in the plan of Creation.