We can only be a truthful witness of that which we have seen or experienced. We can only be a witness for Jesus if we have met Him, experienced Him, and if we know Him.
The disciples of Jesus were such witnesses. We read in 1 John 1:3 the testimony of John: "What was from the beginning, what we have heard, what we have seen with our eyes, what we have looked at and touched with our hands, concerning the Word of Life— 2and the life was manifested, and we have seen and testify and proclaim to you the eternal life, which was with the Father and was manifested to us— 3what we have seen and heard we proclaim to you also, so that you too may have fellowship with us; and indeed our fellowship is with the Father, and with His Son Jesus Christ. 4These things we write, so that our joy may be made complete."
If we follow and obey Jesus we will experience Him all the time and we will be witnesses for Jesus, that He is alive and real. We will live in fellowship with Him and bring others into fellowship with Him, through our testimony and thus we will build the kingdom of God.
Are we witnesses for Jesus. Are we through or testimony bringing others into fellowship with Jesus and building His kingdom?
May Jesus bless you.