The Human Mind Appears Suddenly And Inexplicably Out Of Some Unknown And Unimaginable Void. It Passes Half Its Known Life In The Mental Chaos Of Sleep. Even When Awake It Is A Victim Of Its Own Ill-adjustment, Of Disease, Of Age, Of External Suggestion, Of Nature's Compulsions; It Doubts Its Own Sensations And Trusts Only In Instruments And Averages.