There is overwhelming and increasing interest in the metaphysical, due mainly to undeniable data which cannot be explained naturally or scientifically. Experience and interpretation of the spiritual and supernatural affect many areas of life. The author takes an interdisciplinary approach in presenting the need for spiritual intelligence and in addressing the relevant and complex issues of spirituality and its role in human development. Insights from disciplines such as neuroscience, medical science, natural science, social science, psychiatry, psychology and theology are considered.