I think that this is a very important insight.
The need to make Yitzchak into a great man also explains why G-d commanded
Avraham to sacrifice him.
Avraham had achieved amazing levels of greatness in his life. He achieved
these levels because he had learned how to focuss on G-d's will and to avoid
being influenced by earthly attachments. He was willing to leave home and
family for his faith (Chapt. 12). He was willing to seperate from his nephew
Lot and even sacrifice his possession of the land for the sake of avoiding
an argument (Chapt.13). He even conceeded the spoils of war so that the king
of S'dom would not say, "I have made Avraham rich," (chapt. 14)
Unfortunately, the characteristic of emotional detachment from everything of
importance in this world, including relationships with loved ones, although
a great virtue in G-d's eyes, creates a paradox. The greater he becomes, the
less likely he will be to share his experience of religous greatness with
another human being who will thereby become able to carry on his heritage
into the next generation.
The Akeyda created a situation wherein Avraham would be able to share the
experience of total detachment from all things of this world including loved
ones with "the one he loved, with Yitzchak." On that occasion Yitzchak had
the merit of "walking together" in total dedication to G-d for the first and
probably only time of his life.
This was the only way for Yitzchak to learn to become as great as his father.
Sara understood this. When she heard about the Akayda, she realized that her
life's aim of raising a child to be as great as his father had been achieved.
Andy & Roochie Kohlenberg