In April of 1518 Martin Bucer was 26 studying as a Dominician priest at Heidelberg.

Luther, an Augustinian monk came to defend his views at the city. Bucer liked Luther's ideas. Calvin was 9 years old that year. 

But Bucer and Luther/ Calvin would have different views on Justification. 

Calvin would see justification as extra nos = outside of us. Bucer would see justification as in nobis = in us. Bucer stressed a renovation and participatory view of justification. He continued an Augustinian-Thomistic connection between justification and Sanctification. 

On the other hand, Calvin stressed the objective and external nature of justification with a separation of justification and Sanctification. 

It was a difference of interpretation of Romans 8:4 that Bucer would interpret: in us and what Calvin would interpret in Christ outside of us forensic in heaven. Modern scholars are saying that it is the forensic Christ that fulfilled the law on our behalf and now imputed this torus who cannot keep the law (Douglas Moo 1996). 

Calvin saw justification as an imputation aspect from heaven to us. Bucer saw it as an ontological. Augustine wrote about it: "The law was given in order that grace might be sought: grace was given, in order that the law might be fulfilled...The failure of wisdom of the fleshly mind...had to be healed by grace". 

Augustine did not allow justification to have a forensic sense: however he also viewed justification as a process that involved inner renewal. (see David Fink, "The doers of the law will be justified: The exegetical origins of Martin Bucer's Triplex iustificatio." JTS 58  no. 2 [2007]: 491, n.13). Bucer understood the law as the very expression of the Spirit and image of God. 

A Christian fulfills God's law empowered by the indwelling Spirit, who gives both the passion and capability to observe the law. 

Bucer said: "The Spirit acts by teaching what is truly good and inflaming our desire for it".

In Adventist language, one can say that Ellen White is Bucer and George Knight is Calvin. Right? 

But scholars are saying that Calvin believed in a double grace "gratuitous remission of sins can never be separated from the Spirit of regeneration: for this would be to rend Christ asunder". Commentary on Romans by Calvin on Romans 8:9. (Peter Dubbelman, Bucer's and Calvin's understanding of justification through the lens of Romans 8:4A: IN NOBIS or EXTRA NOS? Dissertation Southeastern Baptist Theological Seminary).