Question

does anyone know the meaning of "all that lives is holy." Chapter 13, pg. 184 of The Grapes Of Wrath

Answer 1

It seems quite literal.

All = Everything
that = an indicator word
lives = is alive, not inorganic or dead.
is = third person singular indicative of be.
holy = recognized by religious belief to be special or divine

So they are saying that according to religious beliefs: if something is alive, it is special.