"I can do all things through Christ which strengtheneth me." Philippians 4:13.
"Finally, my brethren, be strong in the Lord, and in the power of his might." Ephesians 6:10.
"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." Isaiah 40:31.