Neurosis is the inability to tolerate ambiguity.

Taboo restrictions are distinct from religious or moral prohibitions. They are not based upon any divine ordinance, but may be said to impose themselves on their own account. They differ from moral prohibitions in that they fall into no system that declares quite generally that certain abstinences must be observed and gives reasons for that necessity.

Neurosis is the inability to tolerate ambiguity.

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

The different religions have never overlooked the part played by the sense of guilt in civilization. What is more, they come forward with a claim...to save mankind from this sense of guilt, which they call sin.

Where id was, there ego shall be.

There is scarcely room for doubt that something in the psychological relation of a mother-in-law to a son-in-law breeds hostility between them and makes it hard for them to live together. But the fact that in civilized societies mothers-in-law are such a favourite subject for jokes seems to me to suggest that the emotional relation involved includes sharply contrasted components. I believe, that is, that this relation is in fact an 'ambivalent' one, composed of conflicting affectionate and hostile impulses.