If cigars formed, Hamilton worried, it might be impossible to achieve uniform geometry.
"It will be impossible to achieve in the future what Judith and I achieved.
It would be impossible to achieve a national consensus for such a radical move.
"All of this will be impossible to achieve if there is no peace," he said.
Even in the 21st century, it would be impossible to achieve a consensus about the truth.
It seemed a modest proposal but ministers said it would be impossible to achieve within that timeframe.
"But unless the Cuban regime reverses course, peaceful political and economic change in Cuba will be impossible to achieve".
I know there will be those who say the vision I have outlined will be impossible to achieve.
Many Palestinian leaders have therefore concluded that it may be impossible to achieve statehood through negotiations with Netanyahu.
Some worry that Obama may have overpromised, with program changes and worker benefits that would be impossible to achieve.
Efforts to avoid that pitfall can lead to making too-easy predictions or, conversely, predictions so broad as to be impossible to achieve.
