It has been thought for many years (especially since Hume's first Enquiry1) that induction lacks a justification. This justification for induction, it has been thought for long, is necessarily if it is rational to use induction. The argument for why there is no justification, indeed there cannot be a justification, can be presented like this: (A1) n Proposition Explanation 1 If induction cannot be justified inductively or deductively, then it cannot be justified. Premise 2 Induction cannot be justified inductively. Premise 3 Induction cannot be justified deductively. Premise 4 Induction cannot be justified. From 1, 2, 3, Conj., MP. 5 Induction is not justified. From 4, M