He kept going more by an effort of will than anything else.

I let it stay there by an effort of will.

By an effort of will, he kept his voice almost steady.

Also, by an effort of will, I managed to sleep away long hours.

She stopped her tears by an effort of will, and looked back at him.

We're here because we survived, by chance and our best efforts.

By his own efforts, however, he later acquired a good education.

But southern California is a desert made green by much effort.

He swept his mind clear by an effort of will.

He kept his place near the rock by manifest effort.