Shiva Purana
तपोयुक्तशतेभ्यश्च जपयुक्तो विशिष्यते । जपयुक्तसहस्रेभ्यः शिवज्ञानी विशिष्यते १४७ ।
Among those who engage in austerities (tapas), one who practices mantra repetition (japa) is considered superior. Among those who engage in japa (mantra repetition) for a thousand repetitions, the one who possesses knowledge of Shiva (Shivajñāna) is considered the most superior.
english translation
tapoyuktazatebhyazca japayukto viziSyate । japayuktasahasrebhyaH zivajJAnI viziSyate 147 ।
hk transliteration by Sanscript