"No one can estimate the opulence of Krsna. That is unlimited. However, just as one sees the moon through the branches of a tree, I wish to give a little indication."
First a child is shown the branches of a tree, and then he is shown the moon through the branches. This is called sakha-candra-nyaya. The idea is that first one must be given a simpler example. Then the more difficult background is explained.