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Question

Just sharing:

McGraw Hills Idioms Dictionary

What must be, must be. and What(ever) will be, will be. 
Prov. If something is fated to happen, you cannot stop it from happening.; You cannot foretell the future. 
  Harry hoped for many months that he would regain the use of his legs after the accident, but it soon became apparent that he would not. "What must be, must be," he thought resignedly. 
  I'd like to win the contest, but I can't be sure that I will. What will be, will be. 
  The doctors have done all they can. Whatever will be, will be. 

Comments

همچنین:

با قضا کارزار نتوان کرد

You can't fight fate.

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Plus(+)

Answer 1

let the chips fall where they may

Comments

Good, +1

 

Merriam_Websters_Advanced_Learners_Dictionary

let the chips fall where they may
 
   US    informal   : to allow events to happen without trying to change them
  ◇ This phrase usually suggests that you are willing to accept a result, whatever it may be.
   I will run the best campaign I can, then let the chips fall where they may.

Answer 2

Also,

Accidents will happen.

If anything can go wrong, it will.