I cannot recommend highly enough that we look to our roots as Pentecostals and seek to understand the doctrinal wellspring from which our own movement sprang; that is, the Wesleyan-Holiness movement. A study of what Mr. Wesley taught concerning initial sanctification by faith, entire sanctification by faith, and the Christian life in general will yield much fruit, and will, at the very least, greatly challenge the reader to pursue holiness, without which no one shall see God. Wesley's A Plain Account of Christian Perfection is freely available for online reading, and explains the doctrine and gives solid answers to its critics as well. Again, I cannot recommend its study highly enough. Would to God that the Church of God would re-dig the wells of Holiness Theology which have been stopped up by so many for too long. wesley.nnu.edu/john-wesley/a-plain-account-of-christian-perfection/