A.W. Tozer emphasizes the transformative power of a genuine encounter with the Spirit of God, using Blaise Pascal's profound experience as an example. Pascal's life was forever changed by a deep, personal visitation from God, which he described as 'Fire!' and filled with feelings of security, peace, and joy. Tozer argues that such experiences are not the mark of fanatics but rather the ecstatic response of those who are fully yielded to God's presence. The sermon encourages believers to embrace the possibility of divine visitation and the overwhelming joy it brings.