It might be a little complex to set up, but it involved no real mental labor.

It means catching your breath between bouts of physical or mental labor.

Anyone suffering from exhaustion due to overtaxed mental or physical labor would also be restored to full strength and vitality in just 30 days.

At the second stage, consciousness became separated from practical action through the division of mental and manual labour.

Physics in general they took to be unacceptably hard mental labour, but what happened when a gun spat out a bullet†that was interesting.

Porthos appeared to give himself up to a violent mental labor.

He set out to increase the distinction between mental (planning work) and manual labor (executing work).

But even more grueling, they say, was the mental labor.

Why should you destroy a life you have produced by a miracle of mental labor?

How can you possibly know that my theory was the result of a miracle of mental labor?