Thomas Brooks wrote a wonderful book entitled Precious Remedies Against Satan’s Devices. The whole is eminently worth our attention. One of Satan’s devices is to suggest to Christians that their graces are not true, but counterfeit. “Satan doth not labour more mightily to persuade hypocrites that their graces are true when they are counterfeit, than he doth to persuade precious souls that their graces are counterfeit, when indeed they are true” (pg. 99). Brooks goes on to define various kinds of grace, reckoning that knowledge of such graces (and reception from God of such grace) is the best remedy against Satan’s device.