《后汉书·列传·朱冯虞郑周列传》
我以为天地之功不可仓卒而就，艰难之业当累日才能有成。
盖以为天地之功不可仓卒，艰难之业当累日也。
In my opinion, the work of heaven and earth cannot be achieved in haste. Difficult accomplishments must be accumulated over many days before they can be achieved.