The Foundation of Evangelism

How then will they call on him in whom they have not believed? And how are they to believe in him of whom they have never heard? And how are they to hear without someone preaching?
As we brainstorm how we ought to be an evangelistic church, let us remember the foundation of evangelism: the preaching of the Word of God.
This summary was written by Tony Miano:
Evangelism is the announcement, proclamation, and/or preaching of the gospel (1 Corinthians 15:1-4), the good news of and about Jesus Christ. Therefore, the gospel is a communicated message—communicated in verbal (Luke 7:22; Romans 10:14-17) and/or written (Luke 1:1-4) form.
The English word “evangelism” comes from the Greek word euaggelion. Most literally translated in the noun form, euaggelion means: “gospel” or “good news.” In the verb form (euaggelizesthai), the meaning of the word changes slightly to “announce” or “bring good news.” The Greek word in its various forms appears fifty-five times in the New Testament. In addition to the before-mentioned translations, the Greek word is also translated as “preach.”
Evangelism, the communication of the gospel message, includes a warning, an explanation, and a call. Evangelism includes warning people about sin and the consequences of sin (John 16:8; Acts 24:25; Revelation 20:11-15). It includes an explanation of God’s remedy for sin—the gospel (Acts 8:29-35; Romans 3:21-26; 2 Corinthians 5:21). And it includes the clear call to repent (to turn from sin and to turn toward God) and believe the gospel, by faith (Mark 1:15; Luke 13:1-5; Acts 17:29-31; Romans 1:17; Romans 10:9-13).