You cannot have your cake and eat it. 有得就有失。(事难两全其美。)

You cannot burn the candle at both ends. 蜡烛不可两头燃。(鱼和熊掌不可兼得。)

You never know till you have tried. 事非经过不知难。

Youth will be served. 青春好作乐。

Zeal without knowledge is a runaway horse. 无知的狂热是脱缰的野马。

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