觀無量壽佛經義疏 2.67

2.67

「『諦觀於日欲沒之處，令心堅住，專想不移。』」心境相應凝然不動，即定體也。三、顯成相。

"'Contemplate attentively the place where the sun is about to set, causing the mind to remain firm and focused, with concentrated visualization that does not waver.'" The mind and object being in accord, motionless and serene—this is the essence of samādhi. Third, revealing the marks of success.