Shiva Purana
यः स्वयं साधयेच्छक्त्या गुर्वादिनिरपेक्षया ॥ सो ऽप्येवमाचरेदत्र न गृह्णीयात्स्वयं पुनः ॥ ७० ॥
He who achieves this by his own power, regardless of his spiritual master or others. He should also do the same here and not take it back himself.
english translation
yaH svayaM sAdhayecchaktyA gurvAdinirapekSayA ॥ so 'pyevamAcaredatra na gRhNIyAtsvayaM punaH ॥ 70 ॥
hk transliteration by Sanscript