The future principle asserts that the future will be like the past in all relevant ways (i.e. we can use the past to predict what the future looks like). This principle is a necessary condition for induction, but it cannot be justified without induction, resulting in circular reasoning. Hume’s problem of induction, which is yet unsolved, brings this problem to light @sep-induction-problem. Even though we cannot prove that induction is logically sound, we nontheless rely on it daily.