Nietzsche's philosophical treatise Der Antichrist was as controversial in its day as it would appear to be today, to the extent that its publication was delayed by seven years. It was written in 1888, but only published in 1895.
In it, Nietzsche wrote (in German, obviously): "God's first blunder: Man didn't find the animals amusing, – he dominated them, and didn't even want to be an 'animal'." He continued: "Woman was God's second blunder."
The Oxford Dictionary of Quotations refers the reader to Hannah Cowley, an English dramatist writing in 1777: "But what is woman? – only one of Nature's agreeable blunders."
The Oxford Dictionary would seem to be implying that Nietzsche was familiar with the works of Hannah Cowley, and was building on her suggestion.
A blogger named Ahmad Anvari gives a further quote from Nietzsche: "Which is it, is man one of God's blunders or is God one of man's?"
© Haydn Thompson 2020