Though John Ball was not a member of the Westminster Assembly, he had an influential role in some of its formulations.  As Geerhardus Vos has noted, "Because his treatise appeared during the sitting of the Westminster Assembly, just at the time when it set itself to framing the confession, and because it moreover borrowed from Ball in the standards, one naturally supposes that his influence can be detected in its formulation of the doctrine of the covenant."  Even a cursory comparison of Ball with the Westminster Standards shows Vos's assessment to be correct.  Ball was simply representing the mainstream Puritan and Reformed consensus on a number of issues regarding the covenant, including the place and status of the Mosaic covenant.  Ball takes the position that the Mosaic Sinaitic covenant was in essence a covenant of grace.