Given the creation by God of a complete universe, it is a basic assumption that everything is interconnected.
One can see something like that by looking at drops of water.
One sees reflections, smaller ones and bigger ones, like in a house of mirrors—the same thing, the same nature, reflected in different ways.
It follows that if I would know perfectly, completely, entirely, one part, then I would know the whole.
–Rabbi Adin Steinsaltz