The existing texts on the history of psychology have often skipped over the golden ages of Islamic thought while rapidly transitioning from Ancient Greece to Descartes. Thus, students and professionals in the mental health field, who are regular readers of these texts, have been deprived of comprehensive knowledge and interpretations about the origins of modern psychology.  This book aims to recontextualize the views of leading figures in the history of Islamic thought regarding the people’s psychological structure and functioning, the “disturbance” and “recovery” of this structure, in a way that sheds light on contemporary discussions in psychology and psychotherapy. As a result, the historical continuity of knowledge concerning human psychology will be emphasized. Also, it will be possible to draw inspiration from theoretical and practical opportunities overlooked in current discussions. Similar to the phrase “Solid Foundations, New Horizons” used for our book Psychology and Psychotherapy in Islamic Thought, this book you hold is also the product of an effort to build solid foundations while seeking new horizons.