एवञ्चाकृत्रिमानन्दं तावत्साधु समभ्यसेत् ।वश्यो यावत्क्षणात्पुंसः प्रयुक्तः सन् भवेत्स्वयम् ॥ १२५ ॥
In plain words
And so: practise this uncontrived bliss, and practise it well — keep at it until the moment you take it up it is there in an instant, at your command, arising of itself.
Close to the Sanskrit
And thus one should practise this uncontrived bliss well, for just so long, until, being applied, it becomes in an instant subject to the person, of itself.