Rashi: What is the place that you can say 'from here I come'?

Malbim citing RaShaF: The first time, Hashem said "me'Ayin Tavo", which implies that the questioner has no idea. "Ei mi'Zeh Tavo" implies that the questioner knows that it is one of several possibilities, just he is unsure which of them. Malbim - i.e. initially, He asked about all possible lacks. Now He asked which illness that is due to excess food.