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if we got this far, then everything is working properly

Comment found in a code that I was reviewing:

if we got this far, then everything is working properly

Why does this send shivers up my spine?  The procedure is 91 lines long and this comment appears on line 43.  What about the other 48 lines?  What if they fail? 

I should add the following comment to the end of the procedure:

if we got this far then there is a God.

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