What is most central in Calvin’s theology of justification and how does his approach to justification influence his interaction with others?

Calvin’s Theology of Justifiation

What is most central in Calvin’s theology of justification and how does his approach to justification influence his interaction with others? Include how the Reformation doctrine of justification influences issues today. Include 1 additional source along with the sources two sources below:

Chapter 11- McKim, D. K. (2001). Calvin’s Institutes. (abridged ed). Louisville, KY: Westminster John
Knox Press.

Books I, II, & III- Ozment, S. (1981). The Age of Reform 1250-1500: An Intellectual and Religious History of Late Medieval and Reformation Europe. New Haven, CT: Yale University Press.