折疑論 1.38

1.38

譬登萬仞之嶽不可一步而至。必資下以及其高（顏師古書曰。七尺為仞。嶽者山之高廣者也譬喻人登萬仞之山嶽不可一步便到。必自下以至其高上）。

For instance, ascending a mountain peak of myriad fathoms cannot be achieved in a single step; one must rely upon what is below to reach its height. (Yan Shigu's commentary states: Seven chi make a fathom [ren]. 'Peak' [yue] refers to a mountain that is high and vast. It is an analogy: when a person climbs a mountain peak of myriad fathoms, they cannot reach it in one step; they must start from below to reach its height above.)