To understand the Christian life, imagine riding a bicycle in the middle of a two-way street heading up a steep hill. Your job is to keep the bicycle wheels on the yellow line and keep pedalling. If you veer to the left or to the right, with cars zipping past you on both sides, you're road kill. And as you get further up the hill, the forces of gravity and fatigue make pedalling more difficult (so get it out of your head that elderly people go on spiritual cruise control). The challenge continues until the end, and there is no reprieve until we finally arrive home.
Of course, we do veer off the yellow line. Every single day. And when we do, Jesus' victory---the cross, resurrection and pouring out of the Spirit---provides forgiveness and healing. But we are nevertheless called to pedal. When our legs feel shot and we're unable to proceed, we pray for divine strength, and somehow it comes. This is God's promise: "He who began a good work in you will bring it to completion on the day of Jesus Christ" (Phil. 1:6).
From an African missionary quoted by Chris Castaldo. You can read the rest here.
image is by Bichxa at flickr