The following are some online citations (from an unfiltered Google search of Moshe Chafetz's 1710 work Melekhet Machashevet, sorted by parsha:
Lech Lecha | Terumah | Naso | V'Etchanan
Excerpt: "Keep therefore and do them, for this is your wisdom and your understanding in the eyes of the nations (Deut. 4:6)
Some people mistakenly think that wisdom and understanding are unnecessary requirements for fearing G-d, and that any fool can do so easily. In truth, however, a great deal of wisdom and intelligence is necessary to be able to keep the Torah properly. (Rabbi Moshe Chafetz)"
For more information: The Chafetz Project
Contact me at djbrook@sbcglobal.net.