2若能自控还要铅笔干甚
[2 ruò néng zì kòng hái yào qiān bĭ gān shèn]
The humorous saying 'if I could control myself, why would I even need a pencil,' plays with how people might struggle with focus or temptation; the pencil becomes a symbol of one's effort to stay on track in the face of distraction or weakness in will.