Although we tend to think of evangelism only at personal level, it was Lesslie Newbigin who preached the necessity of "social evangelism" so that Christian message can be heard and accepted in wider circle of society. In a society where Christian gospel has become marginalized, the Church has to claim it as a public truth. He served almost forty years as a cross-cultural missionary in the east. Yet, he is better known to us a missionary to western culture by initiating "gospel and culture" movement. His life, ministry, and writings demonstrate us how missiological insights enable someone located within a culture to see beyond that culture. It was he who invited us to re-examine the western culture of modernism from Christian perspective. It was he who advocated that the secularized western culture is a mission filed no less than a foreign mission filed. He even argued that re-evangelizing the western culture would be very strategic for the mission of the Christian Church challenged by modernism and postmodernism. In that his missionary contribution calls for a paradigm shift of Christian evangelism, one might say that his cross-cultural insights is equal to Newton’s discovery of the law of gravity in natural science.