Hucow : The Person Who Says It Cannot Be Done Should Not Interrupt The Person Who Is Doing It.
The person who says it cannot be done should not interrupt the person who is doing it.
Link
For those who like livestock and lacation play
original: https://reddit.com/r/Hucow/comments/1x9vmi/the_person_who_says_it_cannot_be_done_should_not/