[PW] Rachel Carson quotation question

[Michael VanHouten]

Hi everyone -
 
I am trying to verify a Rachel Carson quotation for a faculty member...there seem to be two versions, and I haven't been able to find an authoritative source.
 
Version 1 - "It is a wholesome and necessary thing for us to turn again to the earth and in the contemplation of her beauties to know of wonder and humility."

Version 2 - "It is a wholesome and necessary thing for us to turn again to the earth and in the contemplation of her beauties to know the sense of wonder and humility."
 
I've checked the standard quotation dictionaries to find that this quotation is not included in any of them. I've also checked Google Books and NetLibrary, and have found both versions of the quote, never with an attribution to an original source.
 
Can anyone help me confirm which version is correct?
 
Thanks!
 
Mike Van Houten
Albion College