Verse 38

महतां नित्यतृप्तानां तज्ज्ञानां भावितात्मनाम् ।ईहितं संप्रयातानां नोपकुर्वन्ति सिद्धयः

In plain words

For the great ones, ever content, knowers of That, of cultivated self, who have reached what they strove for -- siddhis render no help at all.