It is clear, therefore, that the law still retains this use; it discovers sin in us. 'I had not known lust, except the law had said, Thou shalt not covet' (Rom. 7:7); and similarly with all sins. This it does, after grace has come, as well as before grace; that which was sin before is sin now; grace does not alter the nature of sin, though it does set the believer free from the fruits and condemnation of it.
Taken from the book The True Bounds of Christian Freedom by Samuel Bolton 1645