Glance behind and look forward, you will find that you will never get anything new if the old one is not gone.
意译的，直接翻译很难，因为中文本身是没有特别强的因果或者逻辑关系。
如果觉得合适请采用
Look at the past and the future, new things will never come if the olds don't go.
Look back to the past and look forward to the future
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