Half Full or Half Empty?

I came across the following passage during my learning. It made me think of the phrase “my cup runneth over.”

Talmud Bavli, Sukkah 46B, Schottenstein ed.:

The characteristic of earthly matters is such that an empty vessel can hold what is poured into it, whereas a full vessel cannot hold anything more. But the characteristic of matters pertaining to HaKodesh, Baruch Hu, is such that a full vessel can hold an even greater measure, whereas an empty vessel cannot hold things at all. As is stated: And if you will listen, you will listen. This teaches that if you will listen at first you will be destined to listen yet another time. But if you do not listen at first, you will not be able to listen later either. Another thing: If you will listen to the old, by reviewing again and again what you have already learned, then you will be able to listen to the new, but if your heart turns away and you abandon that which you have learned by failing to review it, then you will not listen subsequently, i.e. you will not subsequently be granted these insights.

The image of the cup overflowing is meant to indicate unlimited bounty being bestowed, but from the above quotation it would seem that the overflowing cup is in fact undesirable. Overflowing would mean that no more can be absorbed or accepted, perhaps, also, some of what is already received is being lost. Rather than asking that our cup overflow maybe we should request that we be given all that we are able to receive, and that we be granted the ability to absorb even more than that.
It also indicates that we should value that which we already have, and by using and cherishing what which we have already received we earn the privilege of receiving more in the future.