Share your testimony when you feel that the person you are talking
with will relate to what has happened in your life.
A testimony used for evangelism should have three parts.
The way you were before you became a Christian: share enough
about what you were like so that the person you are talking with
can related to who you were and feel, "Yeh, I'm just like that."
What happened: tell what God did to save you. Remember to
include the gospel in this part of
your testimony. That's why we are here. To tell people about the
free gift of Jesus' death.
The way you are now: share just enough about your new life
such the person you are talking with can see you've changed.
Remember, your testimony is not about you, it is about God and
what God has done in your life.