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There is only one thing that makes a dream impossible to achieve: the fear of failure. There is only one thing that makes a dream impossible to achieve: the fear of failure.

Corrections · 3

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I also think the colon is correct. A semi-colon would be used to add a separate clause with its own subject and predicate.
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I think that the colon is correct.
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There is only one thing that makes a dream impossible to achieve: the fear of failure.

There is only one thing that makes a dream impossible to achieve; the fear of failure.

 

It's a pretty tricky point of grammar but I am pretty sure you should use a semi-colon.  A full colon is used at the beginning of a list of things and a semi-colon is used to separate two sentences.  

Otherwise, a great sentence!

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