1-5 It should not be considered unbelievable that one can retrieve useful knowledge and sacred relics from astrological folly and godlessness. From this filthy mud one can glean even an occasional escargot, oysters or an eel for one's nutrition; in this enormous heap of worm-castings there are silk-worms to be found; and, finally, out of this foul-smelling dung-heap a diligent hen can scratch up an occasional grain-seed -- indeed, even a pearl or a gold nugget.
1-6 I have often expressed what an ill-considered thing it is to reject something completely because of its imperfections; for by this process even the science of medicine would not be spared.
(Tertius Interveniens, 1610. It is important to note here that Kepler is referring to a particular kind of astrology ["this astrology"] and not all of astrology.)
http://cura.free.fr/docum/15kep-en.html
