God's promise of His constant presence.
In every valley and every change, the Lord stays with His people.
What the Scriptures say
Let your conversation be without covetousness; and be content with such things as ye have: for he hath said, I will never leave thee, nor forsake thee. Hebrews 13:5 · KJV
Be strong and of a good courage, fear not, nor be afraid of them: for the LORD thy God, he it is that doth go with thee; he will not fail thee, nor forsake thee. Deuteronomy 31:6 · KJV
Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen. Matthew 28:20 · KJV