The Mechanics of Missions: Defining the Missionary Task

Acts 16 stands as perhaps the single greatest New Testament text for understanding how missions work in practice. While other passages more concisely state the church’s mission (Matthew 28:18–20) or better explain missions theology (Romans 15), Acts 16 provides an unparalleled window into missions from beginning to end—answering the fundamental question: What is missions?

As we examine what Scripture teaches about missions and how we should embrace it, three aims must guide our study.

First, we must aim for biblical precision. This article addresses that foundational need. Surprisingly, many churches give little serious thought to missions. Too often, missions remains something distant—relegated to financial support for workers in far-off lands—while receiving minimal theological reflection or strategic consideration.

Second, we must understand how missions is actually carried out. Missionaries are disciple-makers, and the New Testament provides clear guidance on disciple-making methodology. This will be examined in a subsequent article.

Third, each believer must understand their personal role in missions. No one need feel guilty for not being a missionary—every believer has a vital missions role. Understanding that role merits dedicated attention in a third article.

Biblical precision demands a clear definition of missions. In shorthand, missions is cross-cultural evangelism. More precisely:

Each element of this definition carries theological weight and practical implications. Some of the definition will be addressed in the next article, but here we address the first part of the definition: “Missions is the work of the local congregation to send qualified believers into cross-cultural contexts to establish indigenous churches.”

If Acts 16 offers key insights into the missionary task, we must not miss the fact that it all started in the local church. Paul and Barnabas were leaders in the Antioch church, who were commissioned by the church and sent to the mission field to establish indigenous churches (Acts 13:1–3). Later, the church commissioned Paul and Silas to the same work (Acts 15:40–41). The place of the local church in missions must not be undermined.

A missionary—as is evident from the examples of Paul and Barnabas, and Paul’s later companions—is an evangelist commissioned by his local church to cross significant barriers (geographic, linguistic, cultural) for disciple-making through church planting and strengthening.

This definition, while biblical, requires more extensive argumentation than some theological concepts. Unlike defining “pastor” (which is easily done from 1 Timothy 3 or Acts 20:28), missionary work—like the Trinity or biblical economics—demands synthesising multiple texts and principles.

Four key passages illuminate the missionary calling.

This text establishes missions geography: “to the end of the earth.” This creates the cross-cultural imperative. Reaching earth’s ends requires embracing new cultures and languages. While church members may evangelise within their own culture, missionaries must cross cultural boundaries to fulfil this mandate.

Paul’s agricultural metaphor in 1 Corinthians 3:6–8 clarifies missions purpose. Like Paul, missionaries must “plant” gospel seeds, allowing others to water while trusting God for growth.

Paul’s passion focused specifically on unreached peoples (Romans 15:14-21)—planting gospel seeds where Christ had not been named, then training local leaders for ongoing ministry. In contemporary terms, missionaries both plant churches and develop indigenous leadership.

Paul’s list of spiritual gifts establishes that not everyone receives identical calling or gifting. “Apostles” sometimes refers to the Twelve, but also applies to others like Barnabas (Acts 14:14) and James, the Lord’s brother (Galatians 1:19). The term “apostle” (meaning “sent one”) closely parallels the Latin root of “missionary.”

“Evangelists” perhaps even more closely describes missionaries as gospel-bearers to new territories. Philip, called an evangelist (Acts 21:8), exemplifies this role—taking the message from Jerusalem toward Gaza, preaching to the Ethiopian eunuch, then advancing to Azotus, Caesarea, and beyond, establishing foundations wherever he went.

While “missionary” doesn’t appear in Scripture, a clear biblical category emerges: individuals gifted in evangelism, identified and commissioned by their local church to establish gospel foundations and make disciples through church planting.

Since church planting is the goal, missionaries must meet church leadership qualifications (1 Timothy 3:1-7; Titus 1:5-9). Whether termed “missionary,” “church planter,” or “evangelist,” the role remains consistent.

In summary, a missionary is a Christian identified by his church as qualified for church leadership and commissioned to take the gospel to another culture with the specific goal of planting an indigenous church with indigenous leadership.

We must use “missionary” with precision. When we declare that “every Christian is a missionary” or label any sharing of the gospel as “missionary work,” we inadvertently obscure the crucial task of establishing churches “to the uttermost parts of the earth.”

Failing to distinguish between faithful church members who share the gospel with neighbours and commissioned missionaries who plant cross-cultural churches ultimately results in having neither genuine missionaries nor new churches planted globally.

The stakes are too high for imprecise language. The unreached peoples of the world need churches, and churches need missionaries who are specifically called, trained, and sent for this vital kingdom work.