得鱼忘筌：比喻已达目的，即忘其凭借。“荃”亦作“ 筌 ”。筌：捕鱼器。竹制，有逆向钩刺。[@more@]《庄子·外物》：“荃者所以在鱼，得鱼而忘荃；蹄者所以在兔，得兔而忘蹄。”
forget the means by which an end is attained; forget things or conditions that helped bring success once a goal is reached.