Why was it difficult for the Imahos to have children?

Concepts: Why was Yitzchak praying on behalf of Rivka and not himself?; Hashem puts people in situations so they pray; Breakaway from their negative ancestors; Our forefathers and mothers had difficult times having children because they wanted to create their children through prayer; Secret to successful children is prayer; Davening makes you a new person; Less hard labor in Egypt for Jewish nation; Avraham not seeing Esav become bad; Gedolim have time to become great without burden of children.

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