"hoc opus, hic labor est"

'I conclude, therefore, that he excelleth history, not only in furnishing the mind with knowledge, but in setting it forward to that which deserves to be called and accounted good: which setting forward, and moving to well-doing, indeed, setteth the laurel crown upon the poets as victorious; not only of the historian, but over the philosopher, howsoever, in teaching, it may be questionable. For suppose it be granted, that which I suppose, with great reason, may be denied, that the philosopher, in respect of his methodical proceeding, teach more perfectly than the poet, yet do I think, that no man is so much philophilosophos, as to compare the philosopher in moving with the poet. And that moving is of a higher degree than teaching, it may by this appear, that it is well nigh both the cause and effect of teaching; for who will be taught, if he be not moved with desire to be taught? And what so much good doth that teaching bring forth (I speak still of moral doctrine) as that it moveth one to do that which it doth teach. For, as Aristotle saith, it is not gnwsis but praxis must be the fruit: and how praxis can be, without being moved to practise, it is no hard matter to consider. The philosopher showeth you the way, he informeth you of the particularities, as well of the tediousness of the way and of the pleasant lodging you shall have when your journey is ended, as of the many by-turnings that may divert you from your way; but this is to no man, but to him that will read him, and read him with attentive, studious painfulness; which constant desire whosoever hath in him, hath already passed half the hardness of the way, and therefore is beholden to the philosopher but for the other half. Nay, truly, learned men have learnedly thought, that where once reason hath so much overmastered passion, as that the mind hath a free desire to do well, the inward light each mind hath in itself is as good as a philosopher's book: since in nature we know it is well to do well, and what is well and what is evil, although not in the words of art which philosophers bestow upon us; for out of natural conceit the philosophers drew it; but to be moved to do that which we know, or to be moved with desire to know, "hoc opus, hic labor est."'

--Sir Philip Sydney, from The Defence of Poesy