Second line is meant to be complimentary, according to Baike.
Looking at the word, 'singleness' seems to translate better as 'purity'.
According to Baike, this poem was composed by King Wen's grandson, King Cheng of Zhou, so. Btw King Wen was not actually King of Zhou at any point; his son King Wu was the one who did the conquering, and Wen was honoured posthumously as the founder of the Zhou Dynasty.
Re: 267. 維天之命 - Wei Tian Zhi Ming
Looking at the word, 'singleness' seems to translate better as 'purity'.
According to Baike, this poem was composed by King Wen's grandson, King Cheng of Zhou, so. Btw King Wen was not actually King of Zhou at any point; his son King Wu was the one who did the conquering, and Wen was honoured posthumously as the founder of the Zhou Dynasty.