Board Thread:Lore Discussion/@comment-85.74.137.231-20130605091958/@comment-3573184-20130812211625

You are warping the meaning of the text badly.

He was calling heredity a simple matter, and saying that herditiy is not how Dragonborn are chosen.

And the "beyond our understanding", and "how and why" only further show it isn't heredity. if it was, then it wouldnt be beyond udnerstanding, and they would know how and why it is destowed in some cases.