The statement you are referring to is Isaiah 16:12 (KJV):

“And it shall come to pass, when it is seen that Moab is weary on the high place, that he shall come to his sanctuary to pray; but he shall not prevail.”

To understand this verse properly, we must consider the historical setting, the religious practices of Moab, and the spiritual principle Isaiah is teaching.

Historical Context

Chapters 15–16 are a prophecy against Moab, a nation east of the Dead Sea descended from Lot (Genesis 19:37). Throughout the Old Testament Moab was characterized by:

• Idolatry
• Pride
• Hostility toward Israel

Earlier in the chapter Isaiah states clearly:

“We have heard of the pride of Moab; he is very proud” (Isaiah 16:6).

Because of that pride, God announces coming devastation upon their land and cities.

As the nation collapses under judgment, the Moabites will attempt to turn to their religion for help.

“Weary on the High Place”

“when it is seen that Moab is weary on the high place…”

The high places were elevated sites used for idol worship throughout the ancient Near East. Moab especially worshiped Chemosh, their national god.

The phrase “weary” implies:

• Repeated sacrifices
• Frantic attempts to appease their god
• Religious effort that produces no relief

They exhaust themselves with rituals trying to stop the disaster.

Matthew Henry notes that idol worshippers often become “wearied in their superstitions” because false religion never brings real help.

“He shall come to his sanctuary”

This refers to the temple or shrine of Chemosh, the Moabite deity.

When national disaster strikes, the Moabites will go to their sacred temple to plead for help.

Historically we see this pattern among pagan nations:

• They perform sacrifices
• Offer prayers
• Seek omens from their gods

But the problem is simple: their god is not real.

Scripture repeatedly declares that idols are powerless:

“They have mouths, but they speak not: eyes have they, but they see not.”
— Psalm 115:5

“To Pray; But He Shall Not Prevail”

This is the central point of the verse.

Moab will pray sincerely, but their prayer will fail.

Why?

1. They are praying to a false god

Chemosh cannot answer.

Isaiah later says:

“They bear him upon the shoulder… he cannot save them out of their trouble.” (Isaiah 46:7)

False religion offers ceremony without power.

2. Judgment from the true God has already been determined

When God decrees judgment on a nation because of persistent rebellion, religious rituals cannot reverse it.

Moab’s pride had already sealed its fate.

3. External religion without repentance is useless

The Moabites are not turning to the true God of Israel, nor are they repenting of sin.

They simply want relief from the consequences.

This is a pattern seen throughout Scripture:

People seek God’s help without seeking God Himself.

The Deeper Spiritual Principle

This verse reveals a profound biblical truth:

Religious effort without truth cannot save.

Many people:

• Pray
• Perform rituals
• Attend religious services

Yet if their faith is placed in something false, those efforts cannot prevail.

The Bible consistently teaches that only the true God answers prayer.

Contrast With True Prayer

The contrast appears throughout Scripture.

When people turn to the true God in repentance, He hears them.

For example:

“If my people, which are called by my name, shall humble themselves, and pray… then will I hear from heaven.”
— 2 Chronicles 7:14

But Moab refuses humility.

Instead, they cling to their idols.

Application for Today

This passage still speaks powerfully today.

1. Sincerity alone is not enough

Many people pray sincerely, but sincerity does not make false religion true.

Moab’s prayers were real — but powerless.

2. Pride prevents repentance

Isaiah emphasizes Moab’s pride repeatedly (Isaiah 16:6).

Pride keeps people from turning to God.

3. Judgment exposes the weakness of false religion

When crisis comes, false beliefs collapse because they have no real foundation.

4. God alone can answer prayer

The Bible consistently directs prayer to the one true God.

Jesus affirmed this truth:

“No man cometh unto the Father, but by me.”
— John 14:6

Summary

Isaiah 16:12 teaches that:

• Moab will desperately seek help through their religion.
• They will go to the temple of their god and pray.
• But their prayers will fail because their god cannot save.

The verse illustrates the futility of idolatry and the danger of prideful religion.

Only the living God hears and answers prayer, and only those who turn to Him in humility will prevail.