  Our final question is whether Clarke can successfully defend this response. As is clear, the response depends on an analogy between being perfectly powerful (omnipotent) and being perfectly free. His argument can be understood as follows. There are some things God cannot do. He cannot make a square circle. Nor can he choose to do evil. In the first case, his making a square circle is impossible because the idea of a square circle is contradictory. In the second case, the contradiction is in the idea of a perfectly good being choosing to do evil. Since a contradiction is involved in each case, God's power is held to extend neither to making a square circle nor to choosing to do evil. For God's power extends only to what is not contradictory for a maximally perfect being to do. Clarke then claims that the fact that God's power does not extend to making a square circle or choosing to do evil does not imply any diminution of power. And by analogy he infers that it does not imply any diminution of liberty in God.