He also employs it in his letters to Clarke as proof that the Newtonian concept of space contradicts the rational nature of God's actions.  
Leibnitz unnecessarily employs this principle in his proof of the Principle of the Indiscernability of Identicals.  He also employs it in his letters to Clarke as proof that the Newtonian concept of space contradicts the rational nature of God's actions.  Clarke responds that this principle is not violated by Newtonian physics because the will of God is adequate justification for spatial structure.  FTP, identify this principle that requires a rational explanation for the world being a particular way instead of another.
Leibnitz unnecessarily employs this principle in his proof of the Principle of the Indiscernability of Identicals.  
principle of sufficient reason