"I am depressed", "I feel angry", "I am at a loss for words", "I am sick". Ever since I remember myself, I try to understand feelings, interpret words, recognize emotions, justify acts; I try to understand human beings. Finally, I made a profession out of it. This book comes as a result of my journey through human psychopathology. I want to thank Nikiforos V. Angelopoulos, professor of Psychiatry, who escorted and guided me through this trip. Most important, I wish to thank all my patients, who shared their agony and their wisdom with me.