瑜伽師地論略纂 1.139

1.139

「字母」者，謂三十三字、十四音。十四音者，謂𭊀阿、噫、伊、鄔、烏、仡侶、紇閭、呂、盧、醫、愛、污、奧、闇、惡，不取後二，故成十四。迦、佉等五，遮、車等五，吒、𢮎等五，多、他等五，彼、坡等五，夜、邏、羅、縛、賒、娑、婆、訶、叉，不取叉多，故三十三。將前十四音，約後三十三字，出生一切。此等能生一切字故，一切諸義皆能攝故，故名為母，出生字本，含諸義故。

"Syllabary" (mātṛkā) refers to thirty-three consonants and fourteen vowels. The fourteen vowels are: a, ā, i, ī, u, ū, ṛ, ṝ, ḷ, ḹ, e, ai, o, au, aṃ, aḥ; excluding the last two, they make fourteen. The five of ka, kha, etc.; the five of ca, cha, etc.; the five of ṭa, ṭha, etc.; the five of ta, tha, etc.; the five of pa, pha, etc.; ya, ra, la, va, śa, ṣa, sa, ha, kṣa; excluding kṣa, they make thirty-three. Applying the former fourteen vowels to the latter thirty-three consonants generates all things. Because these can generate all letters and can encompass all meanings, they are called "mothers" (mātṛkā), being the roots that produce letters and containing all meanings.