顯密圓通成佛心要集 2.43

2.43

上來供佛利生諸真言等，若不能都各誦持書寫得，皆用准提真言亦得，故《持明藏儀軌經》云：「此准提呪似如意珠，若有行人處處用之，皆得成就。」是也。

Regarding the above mantras for making offerings to the Buddha and benefiting sentient beings: if one is unable to chant, uphold, and transcribe every one of them, using the Cundī mantra in all cases is also permissible. Therefore, the Ritual Sūtra of the Vidyādhara Treasury says: “This Cundī mantra is like a wish-fulfilling jewel; if a practitioner employs it everywhere, all will be accomplished.” This is precisely it.