(Good) heavens!

Inf. an exclamation of surprise, shock, or amazement. (See also (My) heavens!) John: Good heavens! Look at that diamond ring she has! Bill: I bet it's not real. Jane: Ouch! John: Good heavens! What happened? Jane: I just stubbed my toe.

(My) heavens!

Inf. a mild exclamation of surprise or amazement. Bill: Heavens! The clock has stopped. Bob: Don't you have a watch? Sally: The police are parked in our driveway, and one of them is getting out! Mary: My heavens!
References in classic literature ?
Yet may his child be otherwise, Mother of the Heavens