"The child from whom for any reason parental affection is withdrawn is likely to become timid and unadventurous, filled with fears and self-pity, and no longer able to meet the world in a mood of gay exploration. Such a child may set to work at a surprisingly early age to meditate on life and death and human destiny. He becomes an introvert, melancholy at first, but seeking ultimately the unreal consolations of some system of philosophy or theology. The world is a higgledy-piggledy place, containing things pleasant and things unpleasant in haphazard sequence. And the desire to make an intelligible system or pattern out of it is at bottom an outcome of fear, in fact a kind of agoraphobia or dread of open spaces. Within the four walls of his library the timid student feels safe. If he can persuade himself that the universe is equally tidy, he can feel almost equally safe when he has to venture forth into the streets. Such a man, if he had received more affection, would have feared the real world less, and would not have had to invent an ideal world to take its place in his beliefs."