"Since you make evil or good by your own thoughts, it is your ruling of your thoughts which proves to be your principal concern."

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Of all literary exercitations, whether designed for the use or entertainment of the world, there are none of so much importance, or so immediately our concern, as those which let us into the knowledge of our own nature. Others may exercise the understanding or amuse the imagination; but these only can improve the heart and form the human mind to wisdom.

— William Warburton