Saying "May the force be with you" would be to wish someone well, that they would succeed and be protected from dangers. The Force can enhance natural physical and mental abilities, including strength and accuracy, according to the Star Wars movies.
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"May the Force be with you" has achieved cult status and is symbolic of the Star Wars legacy. The line has been said by at least one character in each of the Star Wars movies. In Star Wars Episode IV: A New Hope, there are several mentions of the Force in reference to Luke Skywalker, by Obi-Wan Kenobi ("Use the Force, Luke" and "The Force will be with you, always") and Darth Vader ("The Force is strong with this one").