thoreau

[Rajesh Kochhar]

I am looking for  exact reference to Thoreau's quotation,"A man is wise with the wisdom of his time only,and ignorant with its ignorance".I would appreciate if a knowledgable Listist  could help.
Prof Rajesh Kochhar
Director
National Institute of Science, Technology and Development Studies
Pusa Gate , K S Krishnan Marg , New Delhi 110012
ph + 91 11  5764064 / 5743227   fax 5754640
altenative email rkochhar2000 at yahoo.com
web site  http://nistads.res.in