The green mountains cannot block it - after all, the river flows east; the tide of the times cannot be stopped.
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history
From Xin Qiji's 辛弃疾 Southern Song ci 《菩萨蛮·书江西造口壁》: 青山遮不住，毕竟东流去. (The green mountains cannot hold it back; after all, the river flows east.) Written on a wall at Zaokou in Jiangxi while mourning the Song court's retreat - the flowing river became a symbol of irreversible history.
usage
Always used with its pair 毕竟东流去. The couplet is often quoted to argue historical inevitability.
