"These things I have spoken unto you, that in me ye might have peace. In the world ye shall have tribulation: but be of good cheer; I have overcome the world." John 16:33.
"Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God." Philippians 4:6.
"He gives strength to the weary, and increases the power of the weak." Isaiah 40:29.