Shiva Purana
अष्टादशानां विद्यानामेतासां भिन्नवर्त्मनाम् ॥ आदिकर्ता कविस्साक्षाच्छूलपाणिरिति श्रुतिः ॥ २७ ॥
Śruti mentions that the original exponent and poet of the eighteen Vidyās, each having its own individual path, is the trident-bearing lord himself.
english translation
aSTAdazAnAM vidyAnAmetAsAM bhinnavartmanAm ॥ AdikartA kavissAkSAcchUlapANiriti zrutiH ॥ 27 ॥
hk transliteration by Sanscript