Dasakam 090 - Sloka 06

मूर्तित्रयातिगमुवाच च मन्त्रशास्त्र- स्यादौ कलायसुषमं सकलेश्वरं त्वाम् । ध्यानं च निष्कलमसौ प्रणवे खलूक्त्वा त्वामेव तत्र सकलं निजगाद नान्यम् ॥६॥

मूर्ति-त्रय-अतिगम्-the Trinity transcendingउवाच च मन्त्र-शास्त्रस्य-आदौand (he) said, in the beginning of the Mantra Shastraकलाय-सुषमम्beautiful as the Kalaaya flower (blue lily)सकल-ईश्वरं त्वाम्the Lord of all, Theeध्यानं च निष्कलम्-and meditation on Nish-kala (non-part)असौ प्रणवे खलु-उक्त्वाhe (Shankara) in Pranava, indeed, describingत्वाम्-एव तत्र सकलंThee alone there Sakal (in part)निजगाद न-अन्यम्propounded, not any other

In his famous work of Mantra Shastra, known as Prapanchasaara, Shri Shankara has described Thee as transcending the Trinity - Brahmaa, Vishnu and Mahesh. He has described Thee as a beautiful blue lily and the Lord of all. When he describes the meditation on Nishkala, while dealing with Pranava, he also propounds Thy Sakala form, and of no other deity, Thee as the object of meditation.