《论衡·卷十·刺孟篇》
再说，你是按人的目的给饭吃呢，还是按对你有用给饭吃？ 彭更说： 按目的给饭吃。 
且子食志乎？食功乎？ 
Besides, do you feed people according to their purposes or according to their usefulness to you? Peng Meng said: According to their purposes.