We say, 

11 “What strength do I have, that I should hope?
      And what is my end, that I should prolong my life? 

 12 Is my strength the strength of stones?
      Or is my flesh bronze?

 13 Is my help not within me?
      And is success driven from me? (Job 6:11-13, New King James Version)

But God says, “You have Me. And in Me, you have life. Take My yoke. Carry My burden. But the yoke with which you are bound? The burden that you carry? It is not Mine. Therefore your strength is that of stone, and your courage stiff with fright that you are unable to move. But I say take My yoke, My burden, and I will give you My strength for which to carry it. For My strength does not fail, and My muscles are not lax. But man’s strength fails because they lift man’s burdens. Not Mine. There is a difference.”