The Mantle of Maturity. A History of Ideas about Character Developmentby Christie W. Kiefer, Albany, New York: State University of New York Press, 1988, 243 pp., hardcover. (ISBN 088706-821-9 hc)The Words “mature” and “maturity” are often used by parents, educators and mental health specialists with great authority as though everyone knew exactly what is meant by these words. Christie Kiefer’s book The Mantle of Maturity examines the concept of maturity as it has been understood throughout history with particular application to modern times. Kiefer explains the relativistic nature of the idea of maturity and challenges reductionistic interpretations of it.