Job 28:28
Behold, the fear of the LORD, that is wisdom; and to depart from evil is understanding.
Many professing Christians lack this wisdom and understanding because a certain doctrine (Once Saved, Always Saved) removes a true fear of God out of them and they never truly depart from evil; they remain part-time evil doers by their own admission.
1 Corinthians 1:19
I will destroy the wisdom of the wise, and will bring to nothing the understanding of the prudent.
1 Corinthians 3:19
For the wisdom of this world is foolishness with God. For it is written, He taketh the wise in their own craftiness.
James 1:5
If any of you lack wisdom, let him ask of God, that giveth to all men liberally, and upbraideth not; and it shall be given him. But let him ask in faith...