For even if we know very little that is certain about spirit or soul, the true nature of the body, of materiality, is totally unknown and incomprehen… - Wilhelm von Humboldt

Now, without directly altering the existing condition of things, it is possible to work upon the human mind and character, and give them a direction no more correspondent with that condition; and this it is precisely which he who is wise will endeavour to do. Only in this way is it possible to reproduce the new system in reality, just as it has been conceived in idea; and in every other method (setting aside the evils which arise from disturbing the natural order of human development) it is changed, modified, disfigured by the remaining influence of preceding systems, in the actual state of circumstances as well as in the minds of men. But if this obstacle be removed,—if the new condition of things which is resolved upon can succeed in working out its full influence, unimpeded by what was previously existing and by the circumstances of the present on which this has acted,—then must nothing further be allowed to stand in the way of the contemplated reform.

Whatever does not spring from a man's free choice, or is only the result of instruction and guidance, does not enter into his very nature; he does not perform it with truly human energies, but merely with mechanical exactness

Every development of truths which relate to human nature, and more especially its active manifestations, is attended with a wish to see worked out in practice what theory has shown us to be just and good. To man, whose mind is seldom satisfied with the calmly beneficent influence of abstract ideas, this desire is perfectly natural, and it increases in liveliness with the spirit of benevolent sympathy in social happiness and well-being. But, however natural in itself, and however noble in its origin, this desire has not unfrequently led to hurtful consequences,—nay, often to greater evils than the colder indifference, or (as from the very opposite cause the same effect may follow) the glowing enthusiasm, which, comparatively heedless of reality, delights only in the pure beauty of ideas.