I was having a clear out recently and came across a biography of Duncan Campbell, the leader of the revival on the Isle of Lewis in the mid-twentieth century. It's a fascinating read and there are a few surprises here and there.
Even in this short biography one feels something of the sense of God this man reputedly carried. The book is out of print, but the Wiki article will give you a flavour of Campbell's life and impact.
You can find some of his sermons on MP3 here .