Necessary truth depends not on the actual occurence of particular events, but on whether a proposition is true by definition; on whether, for example, it is part of the very concept of triangularity that the sum of the angles of a triangle should amount to 180 degree [regardless of our experience and perspective]. By contrast, contingent truth depends on circumstances which may change from time to time, such as in the case of the statement "it is raining".

...in the Bible truth is contingent rather than necessary because it is related to historical events. It is "not the result of logical necessity...The truth of God must prove itself anew." The Greek dualism between true being and changing sense-appearance is superseded in the biblical understanding of truth. Here, true being is thought of not as timeless, but instead as historical and it proves its stability through a history whose future is always open."

Quoted from Anthony Thiselton, The Two Horizons: New Testament Hermeneutics and Philosphical Description

Quotation within text from Wolfhart Pannerberg, Basic Questions in Theology, 3 vol.

God's revelation consisted simply in God's letting men state God's own problems in their language - Ernst Fuchs

Christmas, if anything, demonstrated to us a passionate god who deals, rather than a disinterested aged big guy up there who never really age because history and time don't matter.