Reposting a comment I made a few days ago, since it's still relevant:

I was curious about the flag, so did a little reading. Apparently the "Appeal to heaven" is referring to John Locke's writings regarding the right to revolution:

And where the body of the people, or any single man, is deprived of their right, or is under the exercise of a power without right, and have no appeal on earth, then they have a liberty to appeal to heaven, whenever they judge the cause of sufficient moment. And therefore, though the people cannot be judge, so as to have, by the constitution of that society, any superior power, to determine and give effective sentence in the case; yet they have, by a law antecedent and paramount to all positive laws of men, reserved that ultimate determination to themselves which belongs to all mankind, where there lies no appeal on earth, viz. to judge, whether they have just cause to make their appeal to heaven.

(Second Treatise of Civil Government. John Locke)

Locke’s contention was that no man had inherent power to regulate or restrict divine arbitration in civil affairs. Even in dire circumstances, he alleged, natural rights transcended the political process.