Conversely, if He purposed to bless a nation, and then it did evil and was disobedient to Him, He could change His mind and not bless it. God does not repent as humans do, but He does relent. That Isaiah , He does not abandon evil ways for good ways, nor does He change His mind about everything, but He does become less severe (or more severe) in dealing with people. [1] The character of the clay determined to some extent what the potter would do with it. People who broke the covenant and rejected Yahweh"s sovereignty over them were not material through which He would fulfill His purposes. [source][source][source]
"The principle is simply the working out of covenant stipulations. Treaties and covenants regularly included conditions for the covenant. For the keeping of covenant, the lord promises blessings on the vassal; but for breaking covenant, the lord promises punishment for the vassal. What was true in the political arena was also true for God and his relationship with his creation. The closest biblical parallel to a working out of this principle is the case of the Ninevites in the Book of Jonah." [2][source]
"This is a statement of first-class importance for our understanding of all prophecy, removing it entirely from the realm of fatalism. However stark the prediction (except where God has expressly declared it irreversible), it is always open to revision ..." [3][source]