A calm and sober inquiry concerning the possibility of a trinity in the godhead, in a letter to a person of worth; occasioned by the lately published considerations on the explications of the doctrine of the trinity, by Dr. Wallis, Dr. Sherlock, Dr. S—th, Dr. Cudworth, etc. Together with certain letters, (hitherto unpublished) formerly written to the Rev. Dr. Wallis on the same subject