"As your days, so shall your strength be. There is none like unto the God of Jeshurun, who rides upon the heaven in your help, and in his excellency upon the sky. The Eternal God is your refuge, and underneath are the everlasting arms." (Deuteronomy 33:25-27)
Read the context, and see how exactly it coincides with the text, "As your days, so shall your strength be." (Deuteronomy 33:25)
This is commonly quoted, "As your day so shall your strength be," and is taken to mean that whatever any day may bring, strength will be given to bear it. This it does mean, and more, too.
What it says, and what the Hebrew expresses still more plainly, is that as many as our days may be, while they last, strength will last. Strength is to increase with our days, when we continually rest in the everlasting Arms. This is in harmony with the assurance that: "They that wait upon the Lord shall renew their strength." (Isaiah 40:31)--Present Truth, December 15, 1904--Deuteronomy 33:25-27
E.J. Waggoner