Shavua Tov. Today’s Parsha has the words, למען תספר באזני בנך, in order that you speak in the ears of your children. In the שמע it says, למען ירבו ימיכם, in order that you live a long life.
The מעינה של תורה says that the connection between the two words למען, is to teach a valuable lesson. If our only reason for existence is to teach our children, and instill in them proper Jewish values, for that alone we will be granted long life. Homiletically, the word למען combined to emphasize Jewish education. Our entire existence depends on this continuing chain of parent to child and grandparent to grandchild. Each of us must do our part to continue this chain.