Nyaya - A highly educated youngmen not being able to mount upon his own shoulder.

न हि सुशिक्षितोपि नट्वटुस्वस्कन्धमरोढुं पटुः न्यायः

It denotes that an impossible and impracticable thing cannot be affected by any one however highly qualified he may be just as a youngman though very learned and wise cannot get upon his own shoulder when he is asked to do so.