The first effect of the mind growing cultivated is that processes once multiple get to be performed in a single act. Lazarus has called this the progressive "condensation" of thought. ... Steps really sink from sight. An advanced thinker sees the relations of his topics is such masses and so instantaneously that when he comes to explain to younger minds it is often hard ... Bowditch, who translated and annotated Laplace's Mรฉchanique Cรฉleste, said that whenever his author prefaced a proposition by the words "it is evident," he knew that many hours of hard study lay before him.
William JamesWhen happiness is actually in possession, the thought of evil can no more acquire the feeling of reality than the thought of good can gain reality when melancholy rules. To the man actively happy, from whatever cause, evil simply cannot then and there be believed in.
William JamesMan, whatever else he may be, is primarily a practical being, whose mind is given him to aid in adapting him to this world's life
William James