'...depression can be seen as having a very positive potential; indeed it is part of the way God has made us. It is, in reality, a part of our body's "early warning system," alerting us to the fact that something is wrong and needs to be dealt with. We may need to slow down, seek medical treatment, turn to God in repentance or allow the grieving process to take its course. Depression may be an agent used by God for our sanity (where depression is a response to loss), or our sanctification (if there is a sinful act or attitude involved). For every loss situation there is an appropriate amount of depression.'
Peter Brain, Going the Distance: How to stay fit for a lifetime of ministry, p.70.