Proverbs 3:5 as The Greatest Commandment
In Proverbs 3:5, Solomon again references Moses in Deuteronomy. “Trust in the Lord with all your heart” is Solomon’s way of saying “You shall love the Lord your God with all your heart and with all your soul and with all your might.”
Understanding Deuteronomy 6:2-6 as the backdrop for Proverbs 3:5, 6 certainly helps us see through the "pop culture" interpretation of Proverbs 3:5, 6 that has neutered it into more of a self-help phrase (how ironic, given we're not to put any stock in our own understanding) to be marketed in nice frames for home and office walls. This isn't a mere "trust" for getting through a hectic day and everything will turn out all right (the typical view of "direct your paths"). This is an abadonment, via "loving the Lord with ALL the heart, soul, and strength", of all self in a salvific context. To not trust is to be a wicked pagan. A crooked path is the path of Madame Folly that leads to eternal "death" (Proverbs 2:18), where the wicked never "regain the paths of life" (2:19).
We live in an evangelical world that is all about "trusting the Lord" and very little about "leaning not on your own understanding". In fact, we want to "trust the Lord" and "hang on to our own understanding". But Solomon does not see these as compatible. To do one (fear or trust the Lord) is to shun the other (do not lean on your own understanding). This is Solomon's call to live as a fool for the gospel (This is Solomon's 1 Corinthians 1-3).
There are no "7 secrets to successful living" in his cynical view of depraved wisdom. I don't know how many times I've heard: "well, you know, God doesn't call us to be stupid". Actually, he does. More often than not, what we think is "wise", is nothing more than pagan wisdom that we've attempted to "baptize"; it is nothing more than an attempt to "Christianize" worldly wisdom (I wonder how damaging our over-realization of "common grace" accounts for the dominance of worldly wisdom in our thought and practice?). "Finding favor and good success in the sight of God and man" (Prov. 3:4) requires us to abandon all self-reliance and lean on a Wisdom that can only be found outside of ourselves.