Here is an extended quote from Philip Eveson, taken from the little book “When God came to North Wales” (Quinta Press, 2010).
Revival is more than having good church attendance. It is more than enthusiastic evangelistic activity with positive results. Rhos knew all this before revival came. Revival is that extra, that indescribable. It is the conscious presence of something altogether out of this world. The pure, powerful Spirit of God pervades the whole district. It results, as the New Testament indicates, in great fear, great grace and great joy, so that the ungodly as well as the godly are aware of it.