Can you explain Mark 8:13–21?

By CopticBot.ai (Coptic Space Inc.) · Last reviewed 2026-10-10

In Mark 8:13–21, we see a transition from the miracle of the feeding of the four thousand to a stern warning from the Lord regarding spiritual discernment. This passage is a profound lesson on the "leaven" of the world and the "dullness" of the human heart.

1. The Warning Against the Leaven (Verses 13–15)

After departing from the Pharisees, Jesus warns His disciples: "Take heed, beware of the leaven of the Pharisees and the leaven of Herod."

• What Is Leaven? In the Coptic Orthodox tradition, leaven represents a small influence that spreads through and transforms the whole mass.
• The Leaven of the Pharisees: This is hypocrisy and legalism. It is the outward appearance of righteousness while the heart is full of pride and judgment. It is the "heresy of self-righteousness."
• The Leaven of Herod: This refers to worldliness, secularism, and sensuality. Herod was a man of the flesh, preoccupied with power and pleasure.
• Theological Warning: The Lord is telling us that if we allow even a little bit of pride (Pharisees) or worldliness (Herod) into our spiritual lives, it will corrupt our entire relationship with God.

2. The Disciples’ Physical Preoccupation (Verse 16)

The disciples, showing their lack of spiritual "sobriety", began to reason among themselves, saying, "It is because we have no bread."

• They heard the word "leaven" and immediately thought of physical food. This demonstrates a "carnal mind." As St. Cyril of Alexandria teaches, when we look at the words of Christ through the lens of our physical needs only, we completely miss the "Life-Giving Spirit" behind His words.

3. The Divine Rebuke (Verses 17–21)

Jesus, perceiving their thoughts, asks a series of rapid-fire questions that highlight their spiritual "hardening":

• "Why do you reason because you have no bread? Do you not yet perceive nor understand?"
• "Is your heart still hardened?"
• "Having eyes, do you not see? And having ears, do you not hear?"

The Liturgical Memory:

Our Lord forces them to remember the numbers of the two miracles:

1. The 5,000: 5 loaves fed them, and they took up 12 baskets (representing the 12 tribes of Israel).
2. The 4,000: 7 loaves fed them, and they took up 7 baskets (representing the fullness of grace for the 7 nations/all the world).

4. Coptic Patristic Insight: The Problem of "Dullness"

The Church Fathers note that the disciples’ problem wasn't just "forgetting" the facts but a failure to perceive the Person behind the facts.

• If, the Creator of the Universe, is in the boat with you, the presence or absence of a physical loaf of bread is irrelevant.
• Hardness of Heart: This occurs when we become "dull" to the presence of God. We worry about our finances, our health, or our "loaves," while the Master of the Sea is sitting right next to us.

5. Practical Conclusion: "How is it you do not understand?"

The passage ends with Christ asking, "How is it you do not understand?" (v. 21). He is calling them—and us—to a higher level of consciousness.

• Living in the Church means moving past a "transactional" faith (where we worry about bread) to a "sacramental" faith (where we recognize Christ as the Provider).
• In the Divine Liturgy, when the priest says "Lift up your hearts," we respond "We have them with the Lord." This is the answer to Mark 8:21. We lift our hearts away from the "leaven of the world" and the worry over "bread" to focus entirely on the One who broke the loaves.

Key Takeaway for Your Life: Do not let the "leaven" of modern secular culture or the "legalism" of religious pride harden your heart. Remember the miracles God has already done in your life so that when you face a new "wilderness," you do not reason with a carnal mind but with a spirit of faith.