It's the spirit of life, as the Scriptures call it, 'the river of living water,' the drying up of which is threatened in the Apocalypse.
It's the aesthetic principle, as the philosophers call it, the ethical principle with which they identify it, 'the seeking for God,' as I call it more simply.

The object of every national movement, in every people and at every period of its existence is only the seeking for its god, who must be its own god, and the faith in Him as the only true one.
God is the synthetic personality of the whole people, taken from its beginning to its end.

It has never happened that all, or even many, peoples have had one common god, but each has always had its own.

It's a sign of the decay of nations when they begin to have gods in common.
When gods begin to be common to several nations the gods are dying and the faith in them, together with the nations themselves.

The stronger a people the more individual their God.