What is the price of Experience? Do men buy it for a song?
Or wisdom for a dance in the street?  No, it is bought with the price
Of all that a man hath, his house, his wife, his children,
Wisdom is sold in the desolate market where none come to buy,
And in the wither’d field where the farmer ploughs for bread in vain.
(’Vala: Night the Second’)
 
Experience & Wisdom… the two great ponderables…
 
I found the quote in "Wittgenstein and Psychoanalysis" by John M Heaton.  Bought it for one euro on Saturday in Vibes & Scribes, Bridge Street, Cork.