Is hard to understand what it is to be the Holy Spirit already for many Christians. Conversely, can in some, such as free churches, denominations or esoteric milieu observe excessive and often indiscriminate use of the term "Holy Spirit". To eliminate the expression nor add a new arbitrariness, Ohly Luke describes the speech of the Holy Spirit in relation to human experience. For this purpose, he selects a phenomenological approach and defined the Holy Spirit as a present phenomenon. For his presence is characteristic that it is also demonstrated by absent things or people. Presence is not reducible to objectivity. Approximately at mourners shows that the absent can be particularly intrusive. Presence thus appears to be a dynamic process, where people can not escape when it occurs. Ohly declares that this phenomenon will appear in the presence of the classical sub-themes of pneumatology. To this end, the concept of faith is further interpreted as loyalty: The justification of the sinner is made solely out of "loyalty", namely in respect to the presence of situations in which people find. This loyalty proves the ratio of Christians to each other as mutual recognition. About this way criteria are derived to reflect current issues of inter-religious ecumenism and church membership critical.