Isaiah 40:29-31 (KJV)
29 He giveth power to the faint; and to them that have no might he increaseth strength.
30 Even the youths shall faint and be weary, and the young men shall utterly fall:
31 But they that wait upon the LORD shall renew their strength; they shall mount up with wings as eagles; they shall run, and not be weary; and they shall walk, and not faint.
Romans 8:31 (KJV)
31 What shall we then say to these things? If God be for us, who can be against us?
Psalm 46:1-3 (KJV)
1 God is our refuge and strength, a very present help in trouble.
2 Therefore will not we fear, though the earth be removed, and though the mountains be carried into the midst of the sea;
3 Though the waters thereof roar and be troubled, though the mountains shake with the swelling thereof. Selah.