In walking with Christ, there is no comfort zone. As everyday, I have to battle my own sinful desire.
Though, those who know Christ, who hear His calling, will always be in a zone of comfort. Even in the midst of suffering, persecution and self sacrifice. As the Holy Spirit is the comforter.
A Christian walks out of comfort zone everyday. Yet at the same time, they are always be in comfort zone as the Holy Spirit dwells in them.