大毘盧遮那成佛經疏 15.4

15.4

時一切智毘盧遮那世尊離眾惱者，聞彼所問祕要之事，而歎之言：善哉善哉勤勇大心。是一切時中大也，大心大願大行等。祕密漫荼羅配尊位決者，謂決定安列諸聖者坐位等也。祕密者，即是如來祕奧之藏，久默斯要如優曇華，時乃說之，苟非其人則不虛授，不同顯露常教也。漫荼羅，是具種種德義，即是如來祕密之德。如是祕密之德，如蓮華開敷而自莊嚴。配尊位決者，是決擇義也。如是蓮花祕密之藏，分別種種分位，所應作事皆決擇之也。決，謂定說也。大悲根原，從大悲根本生發。大乘無上諸佛最祕者，謂此漫荼羅即是無上大乘根原也。謂此菩提之心，以大悲而為根本，亦如胎藏，故言根本也。乘者，謂真言行菩薩事，由是具足方便故，行大直道，一向無留難，得至於真實。猶如乘調良之乘，行大直道至於大城。此即是諸佛最上祕要之法。若廣說者盡未來劫亦不可盡，今但以方便而略說之。今於一言亦具一切義味，故名略說也。是佛密事，汝能問之，我當略說也。已先歎法許為略說，次即隨彼所問次第答之也。

At that time, the omniscient Bhagavat Vairocana, who is free from all afflictions, heard the secret and essential matters that had been asked, and praised him, saying: "Excellent, excellent, you of diligent zeal and great mind!" "Great" in all times refers to great mind, great vows, great practices, and so forth. "Determining the allocation of the seats of the deities in the secret maṇḍala" refers to definitively arranging the seats and so forth of the noble ones. "Secret" refers to the Tathāgata's treasury of profound mysteries, which has long been kept silent like the udumbara flower, spoken only on rare occasions; if someone is not the proper person, it is not casually conferred, unlike the common, apparent teachings. "Maṇḍala" has the meaning of possessing diverse virtues, which are the secret virtues of the Tathāgata. Such secret virtues, like a lotus blossoming, adorn themselves. "Determining the allocation of the seats of the deities" has the meaning of discerning and resolving. In this secret treasury of the lotus, distinguishing the various stages and all the tasks that should be performed are decided and resolved. "Deciding" means speaking with certainty. "The root and source of great compassion" arises and issues from the fundamental root of great compassion. "The unsurpassed Great Vehicle, the most secret of all Buddhas" means that this maṇḍala is the root and source of the unsurpassed Great Vehicle. That is, this bodhicitta has great compassion as its root, also like a womb, which is why it is called the root. "Vehicle" refers to the affairs of bodhisattvas practicing mantras; because they are fully equipped with upāyas, they travel the great straight path, entirely without obstacles or difficulties, and are able to reach the truth. It is just like riding a well-trained mount, traveling the great straight path to reach the great city. This is the supreme, secret, and essential Dharma of all Buddhas. If explained extensively, it could not be exhausted even through future kalpas; now, solely by means of upāyas, it is spoken in brief. Now, within a single word, all meanings and flavors are complete, which is why it is called "spoken in brief." These are the Buddha's secret matters; you are able to ask about them, and I shall speak of them in brief. Having first praised the Dharma and consented to speak of it in brief, he then answers in sequence according to what was asked.