Over every mountain there is a path, although it may not be seen from the valley.

每座山顶都有道路，虽然从山谷不一定看得到。

mirage  noun

[məˈrɑːʒ] 

something illusory and unattainable

幻景；海市蜃楼；幻想；妄想

例句：

It hovered before his eyes like the mirage of an oasis. 

它在他眼前晃动，好像海市蜃楼里的绿洲。