The context of the quote is the relation between science and theology, rather than theological hermeneutics, thought I do think that Welker's essay has hermeneutical implications (for the relationship between "history" and "ontology" go here and here).
Here's the context for the phrase:
Only knowledge of reality constitutes truth, and only truth can quench the thirst that leads to research. ... The point of departure [for scientists and theologians] is difficult. We recognize ... that we find ourselves in a worldwide cultural communication but with multiple rationalities. .. Within this pluralism of rationalities, however, science and theology share something in common. Both are driven by ontological thirst, by the thirst to know reality as it is. Both shun delusion. Both are pursued by truth-seeking communities." (Resurrection, p. xiii).