[Avodah] No joy can equal the resolution of doubt

[LReich]

I'm trying to find the origin of the Hebrew quotation, "Ayn Simchah Kehatoras Hasfekos", 
( No joy can equal the resolution of doubt). 

As far as I know it is not found in Chazal. It can be found in the Metzudas Dovid (Mishlay 15:30).
I have seen it attributed to the Rema (but where?). My unreliable memory indicates that it
was coined by R' Yedaya Hapnini or R' Solomon ibn Gabirol (11th Century).

Can anyone help in resolving this doubt?

Elozor Reich
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