The experimental or experiential aspect of the Christian life has been seriously neglected during the present century. Certain factors and tendencies have led to this unfortunate condition. Chief among these has been a superficial evangelism which has neglected real conviction of sin and repentance and encouraged an easy believism. Secondly, there has been a theory of sanctification, more psychological than spiritual and scriptural, which has discouraged self-examination and taught that we have only to 'leave it to the Lord.' Thirdly, and more recently, has been an unbalanced emphasis on intellectual understanding of Truth, the social application of Truth, and the manifestation of particular spiritual gifts. All this has greatly impoverished the spiritual life of both the individual Christian and the churches, and led to coldness, barrenness, and loss of power. The greatest need of the hour is a return to the emphases of the Evangelical Awakening. It is in the belief that this classic of the spiritual life and warfare can greatly stimulate and hasten that return that I encouraged my wife to translate it, and am now happy to commend it, and to advise all Christians to read it. I would particularly urge ministers and pastors to read it, not only because it will prove to be an invaluable help in what is now called counselling of individuals, but also because I would press upon them the importance of introducing such meetings into the life of their churches. Much untold blessing would follow. -From the introduction by Dr. D.M. Lloyd-Jones. Rev. William Williams, was a preacher and leader in the 18th century in Wales. A great hymn-writer and poet, he became the recognized leader andauthority in organizing and conducting the experience meetings of the Methodist or Evangelical Awakening.