So soon after being enabled to understand and lifted out of their doubts, and their faith being brought back to life, they are to be witnesses for Christ. Christ knows his own, and he had chosen these apostles according to divine wisdom.
But we too are witnesses because we have not only heard the message, but it has taken root in our hearts, and we have firsthand knowledge that it is true. It is out of our experience of salvation that we speak, for we speak of what is more certain to us than any of the disciplines we learned at school. The gospel becomes ours in a way that no academic subject could ever be said to be ours. The Spirit dwells within us and the Father and Son have taken up residence within us. Every Christian is a witnessing Christian.