'Energy' in the Bible

"Here is what Hezekiah says," they told him. "This day is a day of trouble, rebuke, and disgrace, as when children come to the point of birth and there is no energy to deliver them.

He gives strength to those who are tired; to the ones who lack power, he gives renewed energy.

A blacksmith works with his tool and forges metal over the coals. He forms it with hammers; he makes it with his strong arm. He gets hungry and loses his energy; he drinks no water and gets tired.

But I thought, "I have worked in vain; I have expended my energy for absolutely nothing." But the Lord will vindicate me; my God will reward me.

Because of the long distance you must travel, you get tired, but you do not say, 'I give up.' You get renewed energy, so you don't collapse.