Now all these things are from God, who reconciled
us to Himself through Christ and gave us the ministry
of reconciliation, namely, that God was in Christ
reconciling the world to Himself, not counting their
trespasses against them, and He has committed to
us the word of reconciliation. Therefore, we are
ambassadors for Christ, as though God were
making an appeal through us; we beg you on
behalf of Christ, be reconciled to God.
II Corinthians 5:18-20
To be an ambassador of Christ we must speak
for Christ by speaking as Christ would speak,
and act for Christ by acting as Christ would act.
Which really means, that we live for Christ by
living as Christ would live.