For me, the most undervalued book is The Art of Worldly Wisdom by Baltasar Gracian y Morales. It's a small book of very condensed and timeless wisdom in the fo

For me, the most undervalued book is The Art of Worldly Wisdom by Baltasar Gracian y Morales. It's a small book of very condensed and timeless wisdom in the form of maxims, written very poetically. It's not a self-help book, the kind you might picture. (any book is self-help in some way). Perusing 5-10 maxims a day about 5 years ago heavily influenced the way I live my life, and still defines my character today.