As I understand sanctification, it is the recognition that we grow in holiness by the power of the Holy Spirit. But such an observation is in itself insufficient as grounds for its rejection. No where in Scripture are these terms used, yet you and I agree on all of them. The Scripture teaches each, not by name, but by meaning. I suggest purgatory is no different.
Scripture substantiates our earlier remarks.
Again, such a view is incompatible with the doctrine of sanctification. There is no reason for us to believe that the one act that justified me also automatically forgives subsequent sin irrespective of contrition. Such a view is incompatible with Scripture, as well as it serving as a license to commit whatever act we so desire since forgiveness is already received or gotten without contrition. This is dangerously close to the abuses associated with the doctrine of indulgences. It will be revealed with fire, and the fire will test each man's work.