You will receive power when the Holy Spirit comes on you; and you will be my witnesses. - Acts 1:8, NKJV
Jesus described the powerful witness of a life that is different when He illustrated it as “the light of the world” (Matt. 5:14). The primary value of light is that it is so different from the darkness. When Jesus then informed His disciples that “you will be my witnesses,” (Acts 1:8) it was clear that one primary value of the apostles’ witness would lie in the difference of their lives from those who lived around them.
A witness that is lived can be as powerful as one that is spoken. It’s not what you say but who you are that catches the attention of those around you – which is one reason God allows grievances, crises, sufferings, injustice, and hardship to come into our lives. Because problems offer us the opportunity to give silent, relevant witness to the difference faith in God can make. The problems enable us to become a showcase so that the world can look into our lives and see the glory of God revealed.
From God's Story