It is not so much the understanding that constitutes the specific difference between the man and the brute, as the human quality of freedom...and it … - Jean-Jacques Rousseau

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It is not so much the understanding that constitutes the specific difference between the man and the brute, as the human quality of freedom...and it is particularly in his consciousness of this liberty that the spirituality of his soul is displayed. For physics may explain in some degree the mechanism of the senses and the formation of ideas; but in the power of willing or rather of choosing, and in the feeling of this power, nothing is to be found but acts which are purely spiritual and wholly inexplicable by the laws of mechanism