'Possible' in the Bible

But Balaam, in answer; said to the servants of Balak, Even if Balak gave me his house full of silver and gold, it would not be possible for me to do anything more or less than the orders of the Lord my God.

Even if Balak gave me his house full of silver and gold, it would not be possible for me to go outside the orders of the Lord, doing good or evil at the impulse of my mind; whatever the Lord says I will say?