An exposition of any phase of Paul Tilllch's thought demands an appreciation of his highly individualistic and powerful terminology. For some, this has presented an almost insurmountable obstacle. Otters, having wrestled with its meaning, have discovered an insight and profundity that is at once astounding and fascinating. Such has been my experience. I have been aided in my understanding by a deep respect for what Proffesor Tillich is trying to do, that is, reinterpret Christian thought in terns that have meaning for this age. Welcoming his departure from traditional theological language, I have frequently in the course of this thesis allowed Tillich to speak for himself. Only by facing up squarely to his "unconventional language" can one enter fully into the "courageous venture of his original mind, struggling with important questions. Tillich*s terms may be abstract, but his thought is not. It deals rigorously and realistically with the very stuff of life.