氷は水より出でて水よりも寒し

Etymology
From the :

Literally “ice coming from water is colder than water”.

This proverb is not the exact  form of the above Chinese text; the back-formation of this form in pseudo-kanbun would be 冰出於水，而寒於水 (compare ).

Proverb

 * 1) the student has surpassed his or her teacher