That depends on the sense in which you are using "nothing" here. For instance:
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This statement will be true or false depending on whether “Nothing” refers to the word itself or to the word’s meaning. If the word itself is the referent, the statement is true (because, as we see, there it is, the word “Nothing” written in stone). If the
meaning of the word is the referent, the statement is false (because, as we see,
several words are written in stone).
Then there is the meaning of the entire phrase to consider. In context, “written in stone” is shorthand for “unalterable.” The phrase simply asserts the prevalence of changeability, i.e., declares that nothing in the universe is immutable.