This paper will consider the understanding of true spirituality according to Abraham Kuyper and from there move to discuss the needed conceptual religious thinking in today's understanding of public life in Indonesia. Today there are an immense number of studies devoted to demonstrating how religion plays a major part in the development of public thinking, even in the more secular places of the world today. Not a few of those studies are indebted to Kuyper's thinking. This paper will, firstly, consider Kuyper's warning about the danger of superficial mysticism in his "Three Little Foxes," how this vision developed in the pre-Kuyperian reformed thinking, and Kuyper's own understanding of true mystical aspects of Christianity. After a brief survey of Kuyper's appropriation of Reformed theology, I will argue that one aspect that forms the contextual condition for mystical thinking is the presence of other religious mystical understandings contending for dominant influence in the public spheres. In the second part of this paper I will demonstrate how the mystical aspect in other religions in Indonesia, especially Islam, obliges Christians to articulate a biblical version of mysticism along the lines of Kuyper's model. I will attempt to show how Kuyper's thinking provides the needed perspective, especially considering the development of the Islamic movement in education from the early 20th century and the assimilated Islamic liturgy in the public spheres in Indonesia. This needed perspective cannot be executed by Christians with a disoriented understanding of spirituality and latent social perspective problems caused by false mysticism. That is why, concluding the paper, I would argue that the Neo-Calvinist perspective should gain (or regain?) the mainstream of Christian thinking in Indonesia, in the dire situation of the present condition, in developing religious aspect of public life.