If the Church is 'in Christ,' ...

If the Church is 'in Christ,' she is involved in mission. Her whole existence then has a missionary character. Her conduct as well as her words will convince the unbelievers and put their ignorance and stupidity to silence.
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 David Bosch

Quotes from the same author

Mission [is] understood as being derived from the very nature of God. It [is] thus put in the context of the Trinity, not of ecclesiology or soteriology. The classical doctrine of the missio dei as God the Father sending the Son, and God the Father and the Son sending the Spirit [is] expanded to include yet another movement: Father, Son, and Holy Spirit sending the church into the world.
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 David Bosch
To participate in mission is to participate in the movement of God's love toward people, since God is a fountain of sending love.
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 David Bosch