Young people should try things boldly, not be timid and hesitant.
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From 《左传·文公十七年》: 畏首畏尾，身其余几? ('if you fear both your head and tail, how much of you is left?') — originally the Zheng envoy's sharp retort to Jin's overbearing demands. The rhetorical question survives as a rebuke to excessive caution.
