Think about a prisoner of war who suddenly becomes a slave. He still has some spark of freedom left in him. He won't eagerly rush to do dirty, backbreaking work. After a long period of rest, he's gotten soft and can't run fast enough to keep up with his master's horse or carriage. When he's exhausted from staying awake for days and nights, sleep overtakes him. He refuses to do farm work, or does it halfheartedly when he's dragged away from easy city duties and forced into hard labor. In cases like this, we need to make a distinction.
If a prisoner of war, who has suddenly been reduced to the condition of a slave, still retains some remnants of liberty, and does not run nimbly to perform foul and toilsome tasks, if, having grown slothful by long rest, he cannot run fast enough to keep pace with his master’s horse or carriage, if sleep overpowers him when weary with many days and nights of watching, if he refuses to undertake farm work, or does not do it heartily when brought away from the idleness of city service and put to hard labour, we ought to make a distinction