Self-dialogue involves a constant process of demarcation and interaction between "I" and "me," between the speakable and the unspeakable, and between what is said and what is meant. This paper studies self-dialogue in its main aspects. First, it reviews relevant contributions in the existing literature. Second, it attempts a working definition of self-dialogue. Third, it examines self-dialogue with regard to its main dimensions and processes. Fourth, it identifies rules that guide self-dialogue. Fifth, it looks into practical applications and implications of self-dialogue in life and personal management. The major findings and arguments are: Self-dialogue is a fundamental process of expression; it mediates between self-image and social experience; it is regulated by ontological limits, cultural norms, and social rules; and it serves as an adaptive mechanism for self-presentation, identity acquisition, stress management, health maintenance, and personal integration