What does Mark 7:20 say about sin?
What does Mark 7:20 reveal about the nature of human sinfulness?

Canonical Text

“He continued, ‘What comes out of a man, that is what defiles him.’” (Mark 7:20)


Immediate Literary Context (Mark 7:14-23)

Jesus has just overturned the Pharisaic claim that ritual contamination arises from unwashed hands. Verses 18-19 declare all foods clean; verses 21-23 list thirteen vices that “come from within” and render a person unclean. Verse 20 functions as the hinge: human defilement issues from the inner self, not external contact.


Canonical Harmony

• Parallel: Matthew 15:18-19 expands the inner-origin list.

• Old Testament roots: Genesis 6:5; Jeremiah 17:9 (“The heart is deceitful above all things and beyond cure”).

• Pauline affirmation: Romans 3:10-18; Ephesians 2:1-3.

Scripture thus speaks with one voice: sin is native to the human heart.


Theological Implication: Total Depravity

Mark 7:20 evidences the doctrine that every faculty—mind, will, emotion—is tainted. It does not assert people are as bad as possible, but that no part is uncorrupted (cf. Isaiah 64:6). Consequently, external law-keeping, sacraments, or cultural refinement cannot cure defilement; only divine regeneration can (John 3:3-7; Titus 3:5).


Historical Reliability of the Saying

Papyrus 45 (AD ~200), Codex Vaticanus (B, 4th cent.), and Codex Sinaiticus (א) all contain Mark 7:20 with negligible variation, confirming text stability. Early patristic citation by Irenaeus (Against Heresies 3.10.6) shows second-century acceptance.


Archaeological and Cultural Corroboration

First-century mikvaʾot (ritual baths) unearthed in Jerusalem validate the Pharisaic obsession with purity that Jesus confronts. The Dead Sea Scrolls (e.g., 1QS 3-5) list internal evil as man’s true impurity, demonstrating Second-Temple awareness of the heart’s corruption and lending cultural authenticity to Mark’s record.


Psychological and Behavioral Evidence

Milgram’s obedience experiments and Zimbardo’s Stanford Prison study reveal latent cruelty surfacing under minimal prompting, aligning with Jesus’ diagnosis of internal evil rather than purely environmental causation. Developmental studies on toddlers show innate selfishness preceding social conditioning, echoing Psalm 51:5.


Philosophical Consistency

Kant recognized a “radical evil” within; Augustine articulated concupiscence; modern cognitive science locates moral intuition in pre-rational processes. These converge with biblical anthropology: defilement originates in the core of personhood.


Gospel Remedy Grounded in the Resurrection

Because defilement is internal, the cure must be supernatural. The historical resurrection (1 Corinthians 15:3-8; minimal-facts approach) establishes Jesus’ divine authority to grant a new heart (Ezekiel 36:26; 2 Corinthians 5:17). Empirically documented conversion narratives—e.g., the former violent persecutor Saul of Tarsus (Acts 9) and modern testimonies such as Nicky Cruz—illustrate transformative power unavailable through human effort.


Practical and Pastoral Application

1. Self-examination: recognize inward sin (2 Corinthians 13:5).

2. Repentance and faith: receive cleansing through Christ’s blood (1 John 1:7-9).

3. Sanctification: rely on the Holy Spirit to subdue inner impulses (Galatians 5:16-23).

4. Evangelism: confront moralism by pointing to the heart problem and the cross solution.


Summary

Mark 7:20 teaches that human sinfulness is intrinsic, universal, and expressed outwardly from the heart. No external rite can purify; only the atoning death and verified resurrection of Jesus can cleanse and regenerate. The verse encapsulates the biblical worldview of anthropology, necessitating grace and glorifying God as the sole source of salvation.

How can understanding Mark 7:20 help us discern true purity in God's eyes?
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