Genesis 15:1 - After these things the word of the LORD came to Abram in a vision, saying, "Do not fear, Abram, I am a shield to you; Your reward shall be very great."‘Fear not, Abram, because I am thy shield.’ Moreover, by the use of the word “shield,” he signifies that Abram would always be safe under his protection. In calling 
himself his “reward,” He teaches Abram to be satisfied with Himself alone. And as this was, with respect to Abram, a general instruction, given for the purpose of showing him that victory was not the chief and ultimate good which God had designed him to pursue; so let us know that the same blessing is promised to us all, in the person of this one man. For, by this voice, God daily speaks to his faithful ones; inasmuch as having once undertaken to defend us, he will take care to preserve us in safety under his hand, and to protect us by his power. Now since God ascribes to himself the office and property of a shield, for the purpose of rendering himself the protector of our salvation; we ought to regard this promise as a brazen wall, so that we should not be excessively fearful in any dangers.
Despite the obvious error in the translation that John Calvin was using, where according to more accurate translations God says "Your reward will be great," rather than implying "I am your reward," Calvin's point is valid, and very insightful. The man's thoughts are still as vibrant today as they were in his own day.
