Notes from Exodus 3:16, 17
God told Moses to tell the people what he saw and heard at the burning bush. Our God is a God who acts and speaks. One of the most convincing ways to tell others about him is to describe what he has done and how he has spoken to his people. If you are trying to explain God to others, talk about what he has done for you, for people you know, or for people whose stories are told in the Bible.
Notes from Revelation 1:5, 6
Many hesitate to witness about their faith in Christ because they don't feel the change in their lives has been spectacular enough. But you qualify as a witness for Jesus because of what he has done for you, not because of what you have done for him. Christ demonstrated his great love by setting us free from our sins through his death on the cross ("freed us from our sins by shedding his blood for us"), guaranteeing us a place in his Kingdom, and making us priests to administer God's love to others. The fact that the all-powerful God has offered eternal life to you is nothing short of spectacular.