“Thou believest that there is one God; thou doest well: the devils also believe, and tremble.”
King James Version (KJV)
2:19 Thou believest there is one God - I allow this: but this proves only that thou hast the same faith with the devils. Nay, they not only believe, but tremble - At the dreadful expectation of eternal torments. So far is that faith from either justifying or saving them that have it.
Jas 2:19 Thou believest that there is one God. That is very well, but can that alone save you? The devils also believe, and tremble. Even the demons believe that also. See Mt 8:29. Evil spirits confessed Christ, but this confession of faith did not save them.