I have heard in the name of the chazon ish "לפני מעשה - בידי אדם, לאחר מעשה - בידי שמים".
would be grateful if someone can tell me the most reliable source for this.
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Harav fisher said that on 25th shevat 5755 rebbi shlomo zalman aurbach told him in the name of the chazon ish לפני מעשה בידי אדם לאחר מעשה בידי שמים
literally translated as: before an act - in mans hands; after an act - in Hashems hands. this is a very deep hashkafic concept and care must e taken to understand it in its correct context.
minute 19:54 - in hebrew