(3) The Spirit like the wind is _inscrutable_. “Thou canst not tell whence it cometh and whither it goeth.” Nothing in nature is more mysterious than the wind. But more mysterious still is the Holy Spirit in His operations. We hear of how suddenly and unexpectedly in widely separated communities He begins to work His mighty work. Doubtless there are hidden reasons why He does thus begin His work, but often-times these reasons are completely undiscoverable by us. We know not whence He comes nor whither He goes. We cannot tell where next He will display His mighty and gracious power. (4) The Spirit, like the wind, is _indispensable_. Without wind, that is “air in motion,” there is no life and so Jesus says, “Verily, verily, I say unto you, except a man be born of water and of the Spirit, he cannot enter into the kingdom of God.” If the wind should absolutely cease to blow for a single hour, most of the life on this earth would cease to be. Time and again when the health reports of the different cities of the United States are issued, it has been found that the five healthiest cities in the United States were five cities located on the great lakes. Many have been surprised at this report when they have visited some of these cities and found that they were far from being the cleanest cities, or most sanitary in their general arrangement, and yet year after year this report has been returned. The explanation is simply this, it is the wind blowing from the lakes that has brought life and health to the cities. Just so when the Spirit ceases to blow in any heart or any church or any community, death ensues, but when the Spirit blows steadily upon the individual or the church or the community, there is abounding spiritual life and health.