If it's worth doing, it's worth overdoing.

The line expresses a characteristically Randian admiration for intensity, ambition, and uncompromising commitment: if an activity is genuinely valuable, one should pursue it wholeheartedly rather than timidly or half-measured. Read this way, “overdoing” is less about wasteful excess than about refusing mediocrity—pushing beyond minimal effort to achieve excellence. At the same time, the phrasing courts paradox: taken literally, it could justify imprudence or imbalance. Its rhetorical force lies in elevating passionate, maximal engagement as a virtue and in rejecting the cultural ideal of moderation when it functions as an excuse for underachievement.