My question is probably easy:

When did the WoL explicitly learn that he/she lives and fights on the source?
I know the cutscene in the Antitower, but this revelation from the word of the mother/Minfilia is merely an implication if anything.
There should be a scene before ShB where the WoL learned that he/she doesnt come from one of the Shards. The Warrior of Darkness did know he comes from the 1st, Unukalhai knew he came from the 13th reflection.
And in the first ShB quest we could answer the guardian (dont know the npc name) of Crystarium that we come from the "Source". I dont remember such explicit revelation, do you?

Please no spoilers from ShB, I played not far in the MSQ and the answer must lie before ShB content obviously.

Many thanks!