大日經持誦次第儀軌 1.163

1.163

是中有二事不應捨離：謂不捨諸佛菩薩、及饒益無盡眾生心。恒於一切智願心不傾動，此因緣必定得成，隨類悉地也。

In this, there are two things that must not be abandoned: namely, not abandoning the Buddhas and bodhisattvas, and not abandoning the mind to benefit endless sentient beings. Constantly unswerving in one's aspiration for omniscient wisdom, through these causes and conditions one will definitely achieve the siddhi corresponding to one's kind.