John Macmurray [Archive.org URL]

The main difficulty that faces us in the development of a scientific knowledge of the world lies not in the outside world but in our own emotional life. It is the desire to retain beliefs to which we are emotionally attached for some reason or other. It is the tendency to make the wish father to the thought. .. If we are to be scientific in our thoughts… we must be ready to subordinate our wishes and desires to the nature of the world… Reason demands that our beliefs should conform to the nature of the world, not the nature of our hopes and ideals.

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