The supremacy of Jesus Christ as our sovereign and exalted God is our authority for mission. There is not one inch of creation, one culture or subculture of people, one lifestyle or orientation, one religion or philosophical system, that he does not possess full authority over and command to turn from sin and glorify him . . . Indeed, the authority of our mission rests on nothing less than the authority delegated to us by the exalted Lord Jesus Christ who rules over all.
Nevertheless, as Christians enter into their local culture and its subcultures, we must also remember that it is Jesus (not us) who is sovereign, and it is Jesus (not the church) who rules over all. We are to come in the authority of the exalted Jesus, but also in the example of the humble incarnated Jesus. This means that we must come into culture as Jesus did -- filled with the Holy Spirit, in constant prayer to the Father, saturated with the truth of Scripture, humble in our approach, loving in our truth, and serving in our deeds. Once we have the incarnation and the exaltation clear in our Christology, we are then sufficiently ready to contend for the truth of the gospel and contextualize it rightly for various cultures and subcultures of people, as Jesus did and commands us to do.
Secondly, here's a powerful snip from a John Piper sermon set to Hans Zimmer. (His voice kicks in about 57 seconds into the clip.) It's a four minute shot of theological tequila to get your week started right.
If that doesn't excite you, you of all people are to be pitied most.