He is attempting to make the point that we must rely on God for guidance and not on our finite human faculties alone, which I agree with. However, in suggesting that using any understanding or reason means not trusting in the Lord, Stanley throws the baby out with the bathwater. As it says in Proverbs 3:5-6 (NET translation):
Trust in the Lord with all your heart, and do not rely on your own understanding.
Acknowledge Him in all your ways and He will make your paths straight.
The key here is that when the verse says "do not rely on your own understanding"*, it implies that self-reliance is the problem, not understanding. Trust in the Lord does not mutually exclude any and all understanding. This stance would promote a purely blind faith (not Biblical faith). Furthermore, if we are to "Acknowledge Him in all our ways", does that mean that the Bible is telling us to actually throw out understanding (which is one of our ways) and actually means acknowledge Him in SOME of our ways? Absolutely not!
It saddens me that he professes this malignant misconception, as many Christians listen to him and respect his messages.
* The emphasis here is mine