The dark pit of ignorance!
The following is from Spurgeon's sermon,
"The Sinner's End" #486. Psalm 73:17,18
Lack of understanding has destroyed many.
The dark pit of ignorance
has engulfed its thousands!
Where the lack of understanding has not
sufficed to slay, it has been able seriously
Lack of understanding upon doctrinal truth,
providential dealing, or inward experience
has often caused the people of God a vast
amount of perplexity and sorrow, much of
which they might have avoided had they been
more careful to consider and understand the
ways of the Lord.