In 1968, Ervin produced his first work on the Pentecostal experience under the title, These Are Not Drunken As Ye Suppose.This work outlines all Dr. Ervin learned and taught in his church on the subject of Spirit baptism. Considered one of the first scholarly works from a Pentecostal position, Ervin makes a strong exegetical argument for the purpose of the baptism in the Holy Spirit, tongues as evidence, one baptism-one filling and an evaluation of spiritual gifts. The tone and spirit of this text is apologetic. Ervin systematically explains each of the issues of Spirit baptism and Acts. This work is written for the pastor or educator and masterfully reflects the practical and theological arguments of his pneumatology.