《汉书·传·宣元六王传》
张博知道宪王心思转变，又送给宪王书信说： 张博有幸成为大王心腹，几次进献愚策，没有引起您的注意。
博知王意动，复遗王书曰： 博幸得肺腑，数进愚策，未见省察。
Zhang Bo knew that Xian Wang has changed his mind, and sent a letter to the king saying: Zhang Bo was lucky to become the king’s intimate, and many times put forward humble proposals, but none of them were noticed by you.