This is very interesting. I had not come across this quotation of Wesley's before today. I would be interested in what other people think about it:
Wherever riches have increased, the essence of religion has decreased in the same proportion. Therefore I do not see how it is possible in the nature of things for any revival of religion to continue long. For religion must necessarily produce both industry and frugality, and these cannot but produce riches. But as riches increase, so will pride, anger, and love of the world in all its branches.
-- John Wesley