"A true cultivation of the mind is fitted to forward you in your worldly concerns, and you ought to use it for this end. Only, beware lest this end master you; lest your motives sink as your condition improves; lest you fall victims to the miserable passion of vying with those around you in show, luxury, and expense. Cherish a true respect for yourselves. Feel that your nature is worth more than every thing which is foreign to you."
January 1, 1970
https://en.wikiquote.org/wiki/Frugality