God knows

god (anglais)

God, the Supreme Being (God with a capital letter).
Deity, divinity, god (god with a lower case): human beings in the golden age.

God knows. It is only known to God; it is unknown to people. (often modifying a parenthetic concession) It is known unto God; it is certainly true. Usage notes. In the sense “nobody knows”, an interrogative pronoun often follows: “God knows where”, “God knows why” etc.