'Possible' in the Bible

I said to them, "To the extent possible we have bought back our fellow Jews who had been sold to the Gentiles. But now you yourselves want to sell your own countrymen, so that we can then buy them back!" They were utterly silent, and could find nothing to say.

And I sent men to them saying, I am doing a great work, so that it is not possible for me to come down: is the work to be stopped while I go away from it and come down to you?