Shiva Purana
जपस्त्रिधा शिवाभ्यासश्चिन्ता ध्यानं शिवस्य तु ॥ शिवागमोक्तं यज्ज्ञानं तदत्र ज्ञानमुच्यते ॥ ३८ ॥
There are three kinds of chanting, practicing Lord Śiva, worrying about Lord Śiva and meditating on Him. The knowledge which is stated in the Shiva-agama is called knowledge here.
english translation
japastridhA zivAbhyAsazcintA dhyAnaM zivasya tu ॥ zivAgamoktaM yajjJAnaM tadatra jJAnamucyate ॥ 38 ॥
hk transliteration by Sanscript