Why Does God Want Us to Fast?

What Does God Really Want in Fasting?

 

Fasting is an ancient practice.

Believers have fasted for centuries.
It is more than skipping meals.
It is meant to be an act of devotion.

But the deeper question is not:

How should we fast?

The deeper question is:

Why does God want fasting?
What does He truly desire from it?

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1. Fasting Is Not to Impress God

 

Sometimes we may treat fasting as if it increases our spiritual standing.

More sacrifice.
More effort.
More discipline.

But God is not persuaded by hunger.

In Isaiah 58:3–5, the people were fasting, yet they complained:

“Why have we fasted, and You see it not?”

They had performed the ritual. Why was God silent?

God answers clearly. Their fasting was outward. Their hearts were unchanged. They were still oppressing others and living in pride.

Then God asks:

“Is this the fast that I choose?” (Isaiah 58:5)

Fasting alone does not impress God.
He looks at the heart.

As 1 Samuel 16:7 says:

“The Lord looks at the heart.”

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2. God Desires a Humble and Contrite Heart

 

After his moral failure, King David wrote in Psalm 51:16–17:

“You do not delight in sacrifice…
The sacrifices of God are a broken spirit;
a broken and contrite heart.”

If ritual alone were enough, David could have offered more sacrifices.

But he understood something deeper.

God wants inner transformation.

In the same prayer, David asks:

“Create in me a clean heart, O God.” (Psalm 51:10)

He does not say, “I will fix myself.”
He asks God to change him.

Similarly, Joel 2:12–13 calls people to:

“Return to Me with all your heart…
Rend your heart and not your garments.”

God wants repentance that is inward, not merely outward.

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3. God Connects Fasting with Justice and Mercy

 

In Isaiah 58:6–7, God defines the fast He chooses:

• To loose the chains of injustice

• To share food with the hungry

• To provide shelter for the poor

Fasting without justice contradicts God’s character.

In Hosea 6:6, God says:

“I desire mercy, not sacrifice,
and the knowledge of God rather than burnt offerings.”

And in Micah 6:8:

“What does the Lord require of you?
To act justly and to love mercy
and to walk humbly with your God.”

God does not separate worship from character.

If fasting does not produce compassion, humility, and justice, something essential is missing.

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4. Fasting Reveals What Is Inside Us

 

When we fast, we often see our weakness more clearly.

Impatience.
Irritation.
Hidden pride.
Self-centredness.

Jesus warned about outward religious performance in Matthew 6:16–18, urging people to fast in secret before God, not to be seen by others.

Fasting is not only physical discipline.
It is a mirror of the heart.

And Scripture is honest about the human condition.

Jeremiah 17:9 says:

“The heart is deceitful above all things.”

This raises an important question:

Is our problem simply lack of effort?
Or is it something deeper within us?

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5. What Fasting Cannot Do

 

Fasting can sharpen spiritual focus.

But it cannot erase past sins.
It cannot remove guilt.
It cannot undo injustice.

Ecclesiastes 7:20 says:

“There is not a righteous person on earth who does what is right and never sins.”

And Psalm 130:3–4 asks:

“If You, Lord, kept a record of sins, Lord, who could stand?
But with You there is forgiveness.”

If sin is real, then forgiveness must be real.

This is why the sacrificial system existed — because wrongdoing requires atonement (Leviticus 17:11).

But even those repeated sacrifices pointed forward to something greater.

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6. Jesus and the Heart of Fasting

 

In the Gospels, Jesus speaks about fasting (Matthew 6:16–18).
He assumes His followers may fast — but He warns against hypocrisy.

Again, the heart matters most.

But Jesus goes further.

In Mark 2:5, He tells a paralysed man:

“Your sins are forgiven.”

The religious leaders respond:

“Who can forgive sins but God alone?” (Mark 2:7)

Jesus then heals the man to show that He has authority on earth to forgive sins (Mark 2:10–12).

He does not only call for repentance.
He offers forgiveness.

And in Luke 19:10, He says:

“The Son of Man came to seek and to save the lost.”

Fasting may humble us.
But forgiveness reconciles us.

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7. What God Ultimately Desires

 

God desires:

A sincere heart (Psalm 51:17)
Justice and mercy (Micah 6:8)
Repentance (Joel 2:13)
Trust in Him

But Scripture also reveals something more.

In Isaiah 53:5–6, written centuries before Jesus, we read of a Servant who would bear the sins of many.

And in John 6:37, Jesus promises:

“Whoever comes to Me I will never cast out.”

In John 3:16, we read:

“For God so loved the world that He gave His one and only Son… that whoever believes in Him shall not perish but have eternal life.”

Fasting can be a beginning.

But it is not the final answer.

God does not simply want a day of hunger.
He desires a restored relationship.

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A Final Question

 

If you are fasting sincerely, that matters.

But ask yourself:

Has my heart changed?
Do I have assurance of forgiveness?
Am I reconciled to God?

Fasting can humble us.

But only forgiveness brings peace.

If you would like to explore what the prophets and Jesus say about true forgiveness and acceptance, you are welcome to read the Gospels for yourself.

And if you are in Manchester, you are welcome to visit us for a quiet place to reflect or ask questions.

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