There has been much written on the subject of the Holy Spirit, both as to Himself and His work: but something is needed which shall embrace a wider field of enquiry and study. The word pneuma, both in its use and usage, requires more careful and systematic examination than it has yet received. The question we have to ask, and the information we seek, is this: To what does the word pneuma refer each time it is used in the New Testament? When does it refer to the Holy Spirit? And when is it used psychologically or in any other way? In other words, when ought pneuma to be rendered Spirit, and when spirit? When with a capital "S," and when with a small "s"?