Enriched by God's Action

I came across this quote yesterday:
"The effect of evangelism is to enrich life by God's action, no less than the 'shalom' of the whole earth" - Bishop Patrick Yu.
It strikes me that the birth of Christ was an act of evangelism - God's action enriching life bringing 'shalom' to the whole of the earth - "and on earth peace to those on whom his favour rests" (Luke 2:14)
Our evangelism needs to have the same quality - based on an unshakable belief that God's action enriches life founded on our own experience of life enrichment in him.We are recipients of God's action - he has acted 'upon' us and our response at times such as this, Christmas, needs to be one of thanksgiving and appreciative worship.
Happy Christmas!