In order that the student may grasp the idea that I wish to convey regarding the use of suggestion as a means of exerting personal influence, I would have him understand that the mind has two general functions, which (following the terms used by me in my other writings) are known as the Active Function and the Passive Function, respectively. The Active function does the voluntary, volitional thinking, and also manifests what we call "will power." It is the function used frequently by the active, energetic, vigorous, wide-awake man, in his busy moments. The Passive function does the instinctive, automatic, and involuntary thinking, exhibiting no "will power" and manifesting on entirely contrary lines from the Active function. The Passive function is a most valuable servant on man, and really performs the greater part of his mental work, doing all the drudgery and fulfilling its allotted task without receiving praise or thanks. It works uncomplainingly, and apparently without any effort, and never seems to tire. The Active function, on the other hand, works only at the promptings of the will, and uses up a greater amount of nervous force than its Passive brother. It does the energetic active work of the mind, and tires after a great deal of effort and cries out for rest. You are conscious of, more or less, the effort when you employ the Active function, but not so when you use the easy going, faithful, good natured Passive function. I think that you will understand the distinctive features of these two functions, from this brief explanation.