The promise of the Holy Spirit came with this instruction: “You shall receive power when the Holy Spirit has come upon you; and you shall be witnesses to Me…” (Acts 1:8 NKJV). Why should we be His witnesses? Well, first I do not think Jesus gave us an option, His words are: “You shall be witnesses…” Matt Slick of The Christian Apologetics and Research Ministry cites six further reasons why we are to be witnesses – excerpts below:
First, because Jesus commands you to: "Go therefore and make disciples…” (Matt. 28:19). Also, Ezek. 3:11 says, "and go to the exiles, to the sons of your people, and speak to them and tell them, whether they listen or not..."
Second, you must witness because you love the unsaved (if you don't, you should). The most loving thing you can do is present the gospel in hope of bringing others to salvation.
Third, witness because it is a wise thing to do. Prov. 11:30 says, "...he who is wise wins souls." Now, I know I am not a very wise person. But, since God says I'll be wise to win souls, or try to, then great, let me at it. I want to be wise in God's sight.
Fourth, witness to keep people out of hell. Hell is a terrifying place of utter anguish and eternal separation from God. Those who are not saved go there. Witnessing is an attempt to keep them out of hell.
Fifth, witness because it pleases God and brings glory to His name.
Sixth, witness so people may find the love and fellowship of God (1 John 1:3), the greatest of all treasures. I can think of no greater gift than salvation. It frees the sinner from sin, it delivers the lost from damnation, and it reveals the true and living God to those who don't know Him.
The angels of heaven rejoice greatly when anyone passes from judgment into salvation (Luke 15:10). Shouldn't we as Christians rejoice too? Shouldn't we weep over the lost? Shouldn't we ask the Lord of the field to send laborers into His harvest (Luke 10:2)?
Certainly! The salvation of others is the goal of your efforts. The love of God is your motive. Is there anything greater?
As a Christian, you are to witness with truth, honesty, and integrity. As the Lord provides the opportunity, you should respond in a humble and gentle spirit (2 Tim. 2:24). And in that, you should point people to Jesus. It is He alone who saves.
May God help you to grow stronger in His Word and to further equip you to be an effective witness.
Rev. Robert Chew