May Our Strength Equal Our Days

This lesser known verse of How Firm a Foundation holds special promise for every condition of life.  Here are three Scriptures the lyricist may have used to compose this verse:

I am not saying this because I am in need, for I have learned to be content whatever the circumstances.  I know what it is to be in need, and I know what it is to have plenty. I have learned the secret of being content in any and every situation, whether well fed or hungry, whether living in plenty or in want. 
I can do all this through him who gives me strength (Philippians 4:11-13).

 If I go up to the heavens, you are there; 
If I make my bed in the depths, you are there. 
If I rise on the wings of the dawn,
If I settle on the far side of the sea, 
Even there your hand will guide me, 
Your right hand will hold me fast (Psalm 139:8-10).

The bolts of your gates will be iron and bronze,
and your strength will equal your days (Deuteronomy 33:25).