Here are few quotes from one of the most beautiful texts of human history, that is, Plato's Phaedrus. This text is all about madness, or one could say craziness, in its positive sense. I recommend it for everybody to read.
In this text, Socrates for example says about madness:
"there are two kinds of madness, one arising from human diseases, and the other from a divine release from the customary habits." (265a)
"in reality the greatest of blessings come to us through madness, when it is sent as a gift of the gods." (244a)
"And we made four divisions of the divine madness, ascribing them to four gods, saying that prophecy was inspired by Apollo, the mystic madness by Dionysus, the poetic by the Muses, and the madness of love, inspired by Aphrodite and Eros, we said was the best." (265b)
For example, "he who without the divine madness comes to the doors of the Muses, confident that he will be a good poet by art, meets with no success, and the poetry of the sane man vanishes into nothingness before that of the inspired madmen." (245a)
According to Plato philosophy as the love of wisdom is important dimension of this madness of love. In Symposium, Plato says through Socrates of love [Eros] is "a famous hunter, always weaving some stratagem; desirous and competent of wisdom [philosophy], throughout life ensuing the truth; a master of jugglery, witchcraft, and artful speech." (203d-e)
Link to Plato's Phaedrus: http://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%...
"Air is the very substance of our freedom, the substance of superhuman joy....aerial joy is freedom."--Gaston Bachelard--
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