And the children of Israel did so, and gathered some more, some less. And when they did mete it with an omer, he that gathered much had nothing over, and he that gathered little had no lack; they gathered every man according to his eating (The Torah, Exodus, “BeShalach,” 16:17 – 16:18).
We are speaking about how much effort every person can make.
Let’s say I am overweight and asthmatic; I have a bad heart; could I do much stooping over and collecting? While the other, young and agile, can gather a whole bag.
There is no such thing in spirituality! Everything happens according to the conditions you are in. You are evaluated by the specific, individual efforts you make according to your capacity to work.
Manna is the upper abundance that fills a person in accordance with his preparation. To the extent that I am ready to give, I open myself to reception. This is how it works.
From KabTV’s “Secrets of the Eternal Book” 2/4/13