Do you not know? Have you not heard? The Everlasting God, the LORD, the Creator of the ends of the earth does not become weary or tired. His understanding is inscrutable. He gives strength to the weary, and to him who lacks might He increases power. Though youths grow weary and tired, and vigorous young men stumble badly, yet those who wait for the LORD will gain new strength; they will mount up with wings like eagles, they will run and not get tired, they will walk and not become weary.
Learning to "wait for the Lord" is one of the most important patterns to establish in your life!
There is a source of inner strength that the secular world knows nothing about, and that source is God Himself. God has set up life in such a way that we are not able to face life victoriously without Him. Neither do we have the strength to minister to others in the way He desires, without His enabling.
Are you wearing out? Have you come to the end of your own strength? Are you "stumbling badly"? God wants you to learn to "wait for the Lord". He wants you to wait for His leading before moving forward, even with something good. He wants you to wait for His provision, to wait expectantly for His anointing on your ministry. Learn to pray and ask God for His enabling in your life.