Note that trusting Christ is not only a matter of believing, but also obeying. Obeying does not save you, but it shows your faith is real. Not to believe on Christ is to disobey God. God “commands all men everywhere to repent” (Acts 17:30). Romans 6:17 also equates “believing” and “obeying.” True faith must touch the will and will result in a changed life.
We must never minimize the missionary outreach of the church. This passage applies to all lost souls around the world. They cannot be saved unless they call on the Lord Jesus Christ. But they cannot call unless they believe. Faith comes by hearing, so they must hear the message. How will they hear? A messenger must go to them with the message. Let us be faithful to go and tell the world about Jesus and His salvation.
The late Dr. E. Meyers Harrison, veteran missionary and professor of missions, says that there are four reasons why the church must send out missionaries: (1) the command from above – “go ye into all the world” (Mark 16:15); (2) the cry from beneath – “send him to my father’s house” (Luke 16:27); (3) the call from without – “come over and help us” (Acts 16:9); and (4) the compelling from within – “ the love of Christ compels us” (2 Cor. 5:14).
Romans 10:17 So then faith comes by hearing, and hearing by the word of God.