Introduction — Gospel Preaching
The proclamation of the Gospel is not a voluntary activity reserved for those "endowed with charisma": it is normative apostolic halakhah, an obligation transmitted by the direct authority of the risen Christ. The Greek verb kērussō — to proclaim publicly, from kēryx, herald — evokes the figure of the official messenger who bears the king's announcement: he does not speak on his own behalf but by force of the mandate received. The Old Testament root is the messenger of Is 52:7 — "how beautiful are the feet of him who brings good news" — cited by Paul in Rm 10:15 as the necessary structure of the process of faith: sending → proclamation → hearing → faith → invocation.
The universal mandate: go and proclaim
The great evangelizing mandate structures proclamation as a trinitarian and universal act. Three foundational texts define its dimensions:
| Reference | Content | Dimension |
|---|---|---|
| Mk 16:15 | "Go into all the world and preach the Gospel to every creature" | Geographic: universal |
| Lk 24:47 | "Proclamation of repentance and forgiveness in his name from Jerusalem" | Content: kerygma |
| Acts 1:8 | "You will receive power when the Holy Spirit comes upon you" | Pneumatological: dynamis |
The term pasan tēn ktisin — every creature — admits no geographic or social exceptions (Mk 16:15). The verb kērychthēnai is aorist passive: proclamation is an event that occurs, not merely a human activity (Lk 24:47). The geographic structure of Acts 1:8 is concentric: Jerusalem → Judea → Samaria → ends of the earth — mission is not an option but a topology of Christian witness. Acts 1:8 specifies the agent: the dynamis of the Spirit is the necessary condition of authentic witness, not the oratorical talent of the preacher.
Proclamation as ontological obligation
Paul articulates the paradox of apostolic proclamation with rare intensity: "woe to me if I do not preach the Gospel!" (1 Cor 9:16). The Greek term ananakē — necessity, compulsion — denotes not a moral motivation but an ontological obligation: Paul does not choose to preach as one chooses a trade. The structure is that of the prophetic compulsion of Jer 20:9 — "there was in my heart as a burning fire, shut up in my bones" — the inevitability of proclamation as a sign of divine sending.
Acts 4:20 expresses it with disarming directness: "we cannot but speak of the things we have seen and heard" — witness is a consequence of vision, not a communicative strategy. The prayer for parrēsia (boldness) in Eph 6:19 and Acts 4:29 indicates that proclamation requires courage, not spontaneity: predicatory parrēsia is a gift sought in prayer, not a temperamental disposition. The model of the watchman in Ez 33:7-9 — obligated to warn the people on pain of blood-guilt — structurally anticipates the apostolic proclamatory obligation.
The faith-hearing-proclamation-sending chain (Rm 10:14-17)
Romans 10:14-17 constructs the structural logic of the evangelizing process in the form of a regressive chain argument:
- Sending (apostellō, Rm 10:15): no one preaches without being sent by apostolic authority
- Proclamation (kērussō, Rm 10:14): only the one sent proclaims with the guarantee of authenticity
- Hearing (akoē, Rm 10:14): hearing arises from public proclamation, not from private illumination
- Faith (pistis, Rm 10:17): faith arises from hearing the word of Christ
- Invocation (epikaleō, Rm 10:13): only the one who believes can invoke the name of the Lord
The chain is inverted in the argument: "How shall they call on him in whom they have not believed? And how shall they believe in him of whom they have not heard? And how shall they hear without a preacher? And how shall they preach unless they are sent?" (Rm 10:14-15). The logical center is sending: without apostolic mandate, proclamation loses its guarantee of authenticity. Rm 10:17 synthesizes: "faith comes from hearing (akoē), and hearing through the