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I am not a philosopher; nor am I familiar with Gadamer. Nonetheless, this excerpt from the Stanford Encyclopedia of Philosophy may help clarify Gadamer's meaning:
As Gadamer comments in Truth and Method, ‘application is neither a subsequent nor merely an occasional part of the phenomenon of understanding, but co-determines it as a whole from the beginning’ (Gadamer 1989b, 324). Theory and application do not occur, then, in separation from one another, but are part of a single hermeneutical ‘practice’.
Perhaps we could apply this teaching in an orthodox manner to Biblical interpretation by stating that the Bible must both illumine the intellect and guide our behavior in concrete situations. Nevertheless, to avoid a descent into subjectivity, we must bear in mind the teachings of the First Vatican Council.
For the doctrine of the faith which God has revealed is put forward not as some philosophical discovery capable of being perfected by human intelligence, but as a divine deposit committed to the spouse of Christ to be faithfully protected and infallibly promulgated. Hence, too, that meaning of the sacred dogmas is ever to be maintained which has once been declared by holy mother church, and there must never be any abandonment of this sense under the pretext or in the name of a more profound understanding.