Effective clinicians draw on various sources of external knowledge to inform practice. One source can be found in the models of today which are popularized in numerous books and training opportunities. A second source is comprised of discoveries in fields such as medicine, education, philosophy, art, spirituality, and the sciences. Although these two sources provide a wealth of knowledge, effective practitioners also rely on a third source that not only serves as a foundation for practice but also informs treatment strategies. The third source is rooted in traditional psychotherapy theories and the contributions of early pioneers.