The Law as the husband of the fruitful woman procreates many children. For men of all ages have had the idea that they are right when they follow after the Law and outwardly perform its requirements.
 Martin Luther, Commentary on the Epistle to the Galatians (1535). copy citation

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Author Martin Luther
Source Commentary on the Epistle to the Galatians
Topic age requirement
Date 1535
Language English
Reference
Note Translated by Theodore Graebner
Weblink http://www.gutenberg.org/files/1549/1549-h/1549-h.htm

Context

“Paul quotes the allegorical prophecy of Isaiah to the effect that the mother of many children must die desolately, while the barren woman shall have an abundance of children. (Isaiah 54:1.) He applies this prophecy to Hagar and Sarah, to the Law and the Gospel. The Law as the husband of the fruitful woman procreates many children. For men of all ages have had the idea that they are right when they follow after the Law and outwardly perform its requirements. Although the Law has many children, they are not free. They are slaves. As servants they cannot have a share in the inheritance, but are driven from the house as Ishmael was cast out of the house of Abraham.” source