if the case for paedobaptism were potentially plausible, it still is unwise to form a doctrine of an instituted sacrament by inference alone when never mentioned or expressly set down in Scripture. Inference, even if one concludes it good and necessary, cannot be used to invent sacraments or subjects of sacraments, as do the Roman Catholics. There is a limit to valid good and necessary consequence, especially regarding the positive institution of sacraments under the regulative principle. Further,