The author attempts to develop five critical research guidelines from Tommaso Greco’s work entitled “The Law of Trust”. The five critical perspectives are dedicated to: the autonomy of the subject; the nature of solidarity; the paradigm of equity; the claim of the subject as the foundation of the legal system; the responsibility in obeying and disobeying a legal system. The premise of these five perspectives, which are both an instrument of analysis and proposals for in-depth study, is recognised in the general merit of Greco’s book of attempting a refounding of law on the basis of the recognition of the protagonism of the human subject.