《逸周书·卷六·谥法解》
道德纯一完备的谥号 思 。普察万民疾苦的谥号 思 ，通盘考虑事事用心的谥号 思 ，能追悔先前过失的谥号 思 。
道德纯一曰思，大省兆民曰思，外内思索曰思。追悔前过曰思。
The posthumous name Si for those who had complete moral integrity, who paid attention to the suffering of the people, who considered everything carefully, and who could regret their previous mistakes