It may be impossible to think of manna without thinking of the story in Exodus of God providing daily provision to the Israelites in the wilderness. Manna was that strange substance that fed them and all they had to do was pick it up off the ground. But each person had a daily portion, to be gathered on the day of its use. The only day of the week they could gather a double portion without the oversupply “going bad” was in preparation for the Sabbath.
I have come to think of “everyday spirituality” as a kind of manna. It seems to be part of our human nature that life works best for us when we renew our spiritual provisions every day. We are best served, best fed, by pursuing on an everyday basis the spiritual practices that keep us in touch with the Divine. Skipping days works only to our own detriment. The gathering is easy because we are offered a wide range of spiritual practices, and the blessings that come as a result are renewed for us every day. And unlike the Israelites, we are free to gather as much as we want. There are no limits to this daily provision.