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In page Gödel's ontological proof:

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Many philosophers have called the axioms into question. The first layer of criticism is simply that there are no arguments presented that give reasons why the axioms are true. A second layer is that these particular axioms lead to unwelcome conclusions. This line of thought was argued by Jordan Howard Sobel,[1] showing that if the axioms are accepted, they lead to a "modal collapse" where every statement that is true is necessarily true, i.e. the sets of necessary, of contingent, and of possible truths all coincide (provided there are accessible worlds at all).[2] According to Robert Koons,[3]: 9  Sobel suggested in a 2005 conference paper[citation needed] that Gödel might have welcomed modal collapse.[4]