Try not. Do... or do not. There is no try.

This image is of Yoda. One of my all time favorite movies is Star Wars: Episode V - The Empire Strikes Back where we meet Yoda, his voice being done by Frank Oz (1980). One of the best parts of the movie is when Yoda responds to Luke Skiwalker's wimpy whiny words "I'll give it a try." with "No. Try not. Do... or do not. There is no try."