When he was reading a book sometime, he came across the phrase that says, 'As a tree cannot stop a wind though it wants to live in a calm weather, so parents do not wait their child to grow up and take care of themselves,' and he shed tears from regret at his inability to take care of his mother.
あるとき読書をしていると「至於樹欲靜而風不止。子欲養而親不待。」（木は静かにしようとしたが風はやまなかった。子は育ててほしいと望んだが親はいなかった。）の句に出会い、実母に孝行できなかった後悔から落涙した。