I just found a question on Harmonist about the source of this sloka:
"Akashat patitam toyam sagaram prati gacchati |
sarva deva namaskaram Keshavam prati gacchati |"
"All the water fallen from the sky goes to the sea, similarly salutations to all the gods reaches to the one Lord Keshava".
It seemed like it must be famous quote, practically all Vaisnava sects use it to support supremacy of Vishnu/Krishna. But then I found out that this is so called subhashita sloka, not found in any sastra. I`m not sure what that means. Did great acaryas from the past use this verse as evidence? Did they mention it`s source?
Subhasita means well-said, so these are verses very similar to aphorisms in Western culture: bringing across a point in a beautiful way. There are tens of thousands of such subhashitas floating around and collected in different compilations, so it is very common for the authors to be unknown. Subhashitas are not used as pramana, except perhaps when written by a very famous/ sampradayically important person. I have never seen this verse in a GV text.