It was this book, "The Spirit Himself," by Ralph M. Riggs, specifically when reading chapter 13 subtitled "Let Us Now Receive," on April 21st 1979 that I received the Baptism of the Holy Spirit and began to speak with other Tongues. Today, is June 8, 2019, Saturday night, 40 years later. I am preparing my message for church tomorrow morning which happens to be the Day of Pentecost! I rejoice in the truth of the infilling of the Holy Spirit. I have now been filled, and continue to be refilled for 40 years! Other than being saved it's the second most important spiritual gift I have ever received in my walk with the Lord! I highly recommend this book, and may it change your life as much as it has mine. And now it's available electronically - Hallelujah!