As Christians we must learn how to be good witnesses of the gospel of the Lord Jesus Christ. A witness is someone who gives an account of something seen or heard. In a court of law you must be an actual eyewitness or hearing witness. You cannot be a hearsay or eye say witness of what somebody saw or said. It must be a first hand account of what you saw or heard.
So it is with us who are Christians. Our message of the death, burial and resurrection of the Lord Jesus Christ must be a first hand account. We cannot just repeat what the prophets and apostles wrote down. Though their account in the gospels are actual first hand accounts of what they saw and heard :
1 JN. 1.1 That which was from the beginning, which we have heard, which we have seen with our eyes, which we have looked upon, and our hands have handled, of the Word of life;
2 (For the life was manifested, and we have seen it, and bear witness, and shew unto you that eternal life, which was with the Father, and was manifested unto us;)
3 That which we have seen and heard declare we unto you, that ye also may have fellowship with us: and truly our fellowship is with the Father, and with his Son Jesus Christ.
4 And these things write we unto you, that your joy may be full.
5 This then is the message which we have heard of him, and declare unto you, that God is light, and in him is no darkness at all.
In order to be a real witness of the gospel of our Lord Jesus Christ you must be born again. The meaning of this new birth is to be BORN FROM ABOVE. This is a spiritual conception by the Holy Spirit in our own spirit. This is where the gospel becomes alive in us; we serve a risen Savior.
1Peter 1.3
Blessed be the God and Father of our Lord Jesus Christ, which according to his abundant mercy hath begotten us again unto a lively hope by the resurrection of Jesus Christ from the dead,…
Jn.1.10
He was in the world, and the world was made by him, and the world knew him not.
11 He came unto his own, and his own received him not.
12 But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name:
13 Which were born, not of blood, nor of the will of the flesh, nor of the will of man, but of God.
Only by this living relationship with God through our Lord Jesus Christ can we have first hand knowledge of HIS GOSPEL. Without this holy birth by the Holy Spirit we have no relationship with the Father.
JN.15.1
I am the true vine, and my Father is the husbandman
2 Every branch in me that beareth not fruit he taketh away: and every branch that beareth fruit, he purgeth it, that it may bring forth more fruit.
3 Now ye are clean through the word which I have spoken unto you.
4 Abide in me, and I in you. As the branch cannot bear fruit of itself, except it abide in the vine; no more can ye, except ye abide in me.
5 I am the vine, ye are the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing.
As the Holy Ghost moved upon these men they spoke the word of God, this is prophecy. What they wrote down is scripture. Our authority as witnesses comes from scripture. As we read the word the Holy Spirit in us gives us the understanding. It is this first hand living knowledge that is needed to be a true witness of the gospel. We were not there as the writers who were eyewitnesses, but through the illumination of the Holy Ghost who lives in us their eyewitness account becomes ours also.
2 Peter 1.16
For we have not followed cunningly devised fables, when we made known unto you the power and coming of our Lord Jesus Christ, but were eyewitnesses of his majesty.
17 For he received from God the Father honour and glory, when there came such a voice to him from the excellent glory, This is my beloved Son, in whom I am well pleased.
18 And this voice which came from heaven we heard, when we were with him in the holy mount.
19 We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts:
20 Knowing this first, that no prophecy of the scripture is of any private interpretation.
21 For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost.
2 Tim. 3:16
All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
17 That the man of God may be perfect, throughly furnished unto all good works.
Inspiration means God breathed. We can also have this breath of God as we preach, teach and witness for the Lord. Without this you may preach, teach, witness but there is no living power of God. This is why many Christians live defeated lives.
And I, brethren, could not speak unto you as unto spiritual, but as unto carnal, even as unto babes in Christ. 2 I have fed you with milk, and not with meat: for hitherto ye were not able to bear it, neither yet now are ye able. 3 For ye are yet carnal: for whereas there is among you envying, and strife, and divisions, are ye not carnal, and walk as men? 4 For while one saith, I am of Paul; and another, I am of Apollos; are ye not carnal?
2 Thes.3.10 For even when we were with you, this we commanded you, that if any would not work, neither should he eat.
11 For we hear that there are some which walk among you disorderly, working not at all, but are busybodies.
12 Now them that are such we command and exhort by our Lord Jesus Christ, that with quietness they work, and eat their own bread.
13 But ye, brethren, be not weary in well doing.
14 And if any man obey not our word by this epistle, note that man, and have no company with him, that he may be ashamed.
15 Yet count him not as an enemy, but admonish him as a brother.
Therefore brethren we must live our lives pleasing unto the Lord if we are to be His witnesses. Serious Christians walk with the Lord. If we should sin we quickly admit our sin, confess it and are cleansed. This then keeps us right with God and our fellow man.
1Jn. 1.6
If we say that we have fellowship with him, and walk in darkness, we lie, and do not the truth:
7 But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin.
8 If we say that we have no sin, we deceive ourselves, and the truth is not in us.
9 If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.
10 If we say that we have not sinned, we make him a liar, and his word is not in us.
Now your witness has authority and power to do His work. The grace of God operates through your obedience to His word.
1 Peter 1. 22
Seeing ye have purified your souls in obeying the truth through the Spirit unto unfeigned love of the brethren, see that ye love one another with a pure heart fervently:
23 Being born again, not of corruptible seed, but of incorruptible, by the word of God, word of God, which liveth and abideth for ever.
1Pe 1:24
For all flesh is as grass, and all the glory of man as the flower of grass. The grass withereth, and the flower thereof falleth away:
1Pe 1:25
But the word of the Lord endureth for ever. And this is the word which by the gospel is preached unto you.