Psalm 73:25-26

 25 Whom have I in heaven but you? And earth has nothing I desire besides you.

 26 My flesh and my heart may fail, but God is the strength of my heart and my portion forever.


Isaiah 40:29

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



Isaiah 40:31

31 but those who hope in the LORD will renew their strength. They will soar on wings like eagles; they will run and not grow weary,
       they will walk and not be faint.



1 Corinthians 1:8

8He will keep you strong to the end, so that you will be blameless on the day of our Lord Jesus Christ.


Ephesians 3:20

20Now to him who is able to do immeasurably more than all we ask or imagine, according to his power that is at work within us,



2 Thessalonians 3:3

3But the Lord is faithful, and he will strengthen and protect you from the evil one.


1 Peter 5:10

10And the God of all grace, who called you to his eternal glory in Christ, after you have suffered a little while, will himself restore you and make you strong, firm and steadfast.