Ever wondered how the historia salutis relates to the ordo salutis in the duplex gratia? Of course you have, what else would you have been thinking about?!
In laymen's language, this actually might be a question that has crossed your mind: how does the death of Christ as accomplishing salvation relate to my experience of salvation? and How does my being pardoned for sin (by grace) relate to the living of the Christian Life (by grace)?
Those questions are actually related together in the first question: How does the accomplishment by Christ in history of the redemption of the elect (the historia salutis) relate to the application of salvation to the Christian (the ordo salutis) in the "grace upon grace" of pardon for sin and the experience of new life (two graces - duplex gratia).
If you have the terminology down and have your interest up, take a listen to an interview with Dr. Richard Gaffin Jr. on Christ the Center to think along with Gaffin on this matter.