The topic of this paper─sectarianism as expressed in Sung T'ien-t'ai scholars' exegeses of the Contemplation Sutra─represents a noteworthy phenomenon in the Pure Land hermeneutic tradition. The phenomenon owes its occurrence to Ling-chih Yuan-chao's exegesis of the Contemplation Sutra. As Yuan-chao's commentary electively synthesizes the fine points of previous exegeses, it was perceived by Ch'ao-an Tao-yin, a Sung T'ien-t'ai exegete, as honoring Shan-tao's commentary at the expense of that of Chih-i. This paper details Tao-yin's accusation of some hermeneutic points found in Yuan-chao's commentary and relates the persistent sectarianism that characterizes the works compiled by T'ien-t'ai historians from Wu K'e-chi to Chih-p'an. Tao-yin's critique of Yuan-chao's commentary appears as a text called Fu-cheng-chieh, which is no longer extant but survives, in fragments, as interspersed quotes in the Kuan-ching fu-hsin lun by Chuo-an Chieh-tu. Based on this remainder of the Fu-cheng-chieh, this paper also assesses the text, discusses its contents, and reveals the sectarianism that underpins its criticism of Yuan-chao's hermeneutics. Chuo-an Chieh-tu wrote the Kuan-ching fu-hsin lun to uphold Yuan-chao's commentary. In his work, he refutes Tao-yin's accusation of Yuan-chao's ommentary, pointedly listing the flaws of the Fu-cheng-chieh and showing Tao-yin's sectarian sentiment. In his view, Tao-yin, purporting to “build up [T'ien-t'ai's] gate and yard," wrote the Fu-cheng-chieh in which he deliberately distorted Yuan-chao's viewpoints and engaged in an acrimonious attack on Yuan-chao's commentary. As a result, it is full of errors and flaws. Driven by unyielding sectarianism, Tao-yin infuses in his discourse with much bias, which was to inspire such T'ien-t'ai scholars as Wu K'e-chi, Tsung-chien, and Chih-p'an. It shows clearly that his sectarianism had a large impact on T'ien-t'ai's Pure Land exegesis.