雲門匡真禪師廣錄 3.60

3.60

師因見水磨題梁云：「永為不朽，後即破損。」師問僧：「既是永為不朽，為什麼却被水推？」無對。代云：「不因一事，難長一智。」又云：「堯舜之君猶稽於化。」

The Master saw written on the beam of a watermill: 'May it remain forever undecayed,' but later it fell into disrepair. The Master asked a monk, "Since it was to 'remain forever undecayed,' why was it swept away by water?"
There was no reply.
Answering on their behalf, [the Master] said, "Without experiencing an affair, it is hard to grow in wisdom."
He also said, "Even the sovereign rules of Yao and Shun were subject to transformation."