Crossword puzzle clue "it is heaven's first law"

It is "Heaven's first law"

''Heaven, ___ heaven ...''

What heaven takes its law from, per Lao Tzu

"The First Phone Call From Heaven" author

First word of "Stairway to Heaven"

___ Law (basic law of current flow)

"I fought the law and the law ___"

First word across in the first-ever crossword (1913) and the first of a dozen appearances of the word in this puzzle's grid, written word search-style (left, right, down, and diagonally) ... Can you f