This paper, firstly, demonstrates the internal problem of Paul Tillich’s theology in general and theological method in particular in shifting his logos Christology to Spirit-Christology. The motif "particularity-universality" as a key notion is not well-balance through the theological development. Secondly, this paper proposes that the doctrine of Trinity, well-articulated in Tillich’s 1913 work and finds little attention in his mature work, provides a more fruitful and embracing symbol to release the tension and keep it in a dialectical way.