The Mei HaShiloach writes regarding Sarah Eimeinu's denial of her Laughter
(Partial Quote; see in full for context)
עומק הענין בזה, כי מה דאיתא בגמ' (ברכות ל"ג:) הכל בידי שמים חוץ מיראת שמים הוא רק לפי גבול תפיסת שכל האדם, אבל באמת הכל בידי שמים ואף יראת שמים ורק בעוה"ז הסתיר הש"י דרכו.
The (subject) matter is very deep with this (verse), for when the Gemara says (Brachos 33b) "Everything is in the hands of heaven except for the fear of heaven" is only (true) according to the grasp of the human intellect. But in truth "everything is in the hands of heaven"- even fear of heaven- and it is only in this world that H-Shem has hidden his ways...
My Question
Are there any other sources who talk about this idea, or is this the Mei HaShiloach's chiddush alone?