The Difficulty

There is nothing that is difficult for Hashem. What then does it mean , that matchmaking is difficult as splitting the sea ?

Rav Y. Kamenetsky explains that Hashem has created the water to flow a certain way thus to change that is called difficult in the sense of different then what Hashem has decreed for the norm.
So too , people are born separate per Hashems will , thus it is considered a challenge to understand the great Mitzva to marry & form a bond with ones spouse as if they were one united entity.
Now may be a good time for a gem of Torah study.
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