One of the Biblical passages which is commonly talked about in missionary minded churches is Matthew 28:18-20, commonly referred to as The Great Commission.
Then Jesus came near and said to them, “All authority has been given to Me in heaven and on earth. Go, therefore, and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe everything I have commanded you. And remember, I am with you always, to the end of the age.”
In this passage Jesus is instructing the disciples, immediately prior to the ascension, to make a concerted effort to reach all nations with the gospel message. Notice also that the instruction is specifically extended to the end of the age, verifying we are to keep at it until He returns. This process of trying to spread the message, church and life practices of Christianity to all the world is commonly called missions.
I have a very high view of missions.
I believe that a church which ceases to work toward missionary actions and purposes has ceased to be a church. Yes, I know that is a very strong statement. Just as we would say a person who does not believe the Bible and will not submit themselves to Jesus is not a Christian, a congregation that is not interested in reaching their neighborhood nor their world, is not a church. Of course there are other things a church needs too, but for this discussion on missions I will confine my evaluation of the church to this one qualification.
In the same, ‘by their fruit you shall know them’ way that we evaluate believers, we can evaluate groups of believers. A group which is not interested in missions is fundamentally defining itself as having different purposes, or at least different priorities, than those assigned the church by its founder.
For my readers, here is what I want you to take away. When your church is meeting, teaching, planning, budgeting, worshipping, and whatever else they happen to do, be a strong advocate for missions. You will do a great deal to protect your congregation by keeping it busy on the task assigned to it by our Savior. As a rule of thumb, it is when a congregation loses this missionary focus that they begin to fail.