when the accented syllable is written as an upbeat, it is as if in its urgency to be heard the word has spilled over the bar line, come in early. That effect of spilling over will be heard myriad times in the mass, often at moments of greatest exaltation. A downbeat is an arrival; an upbeat points forward. It is that primal pointing forward, or more relevantly pointing upward, that Beethoven is concerned with. It begins on an upbeat pointing forward and upward.
Odd quality of starting on an up-beat: Ky -- RI - e
