[Avodah] Why should one have to make Hataras Nedarim every year?

[Professor L. Levine via Avodah]

See http://tinyurl.com/hhz4a63  Page 2 of 2.

Note the last paragraph says "Behold I make formal declaration before you and I cancel from this time onward all vows, ..

In light of this,  why should one have to make Hataras nedarim every year?  It seems to me that saying it once should suffice forever.


YL
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