I will give power to the exhausted and I strengthen the weak.

Isaiah 40:29 New International Version (NIV)

29 He gives strength to the weary
    and increases the power of the weak.

We live in an upside down kingdom where the first will be last and the last will be first. The greatest will be the least and the least will be greatest. In 1 Corinthians 1:26-29, the Apostle Paul says that God has chosen the weak things of the world to shame the strong. 

There is something in the heart of God that rushes to the defense of those who can't defend themselves and to those who have no illusion of their own personal power. We see this at work in Paul's own life when he was struggling with a 'thorn in the flesh' that just wouldn't go away (2 Corinthians 12:6-8). This is when Jesus appeared to Paul and said that God's strength is made perfect in his weakness. 

So if you are feeling powerless today, be comforted in knowing that God gives power to the weak and those who are feeling exhausted. You are in a good place for the strength of God to be revealed in you and through you.