A retreatist spirituality is not a spirituality that can, or will, transform the world in Jesus's name.
The quest for heroic adventure then is a quest for the gospel, although it might not be seen that way by everyone.
Every Christian is a sent one. There is no such thing as an unsent Christian.
You plant the gospel. You don't plant churches.
We have to assume now that all mission is cross-cultural.
There is no doubt that to walk with Jesus means to walk on the wilder side of life.