There is no eye like that of knowledge. There is no penance like the practice of truth. There is no sorrow like attachment. There is no happiness like renunciation.
नास्ति विद्यासमं चक्षुर्नास्ति सत्यसमं तपः। नास्ति रागसमं दुःखं नास्ति त्यागसमं सुखम्॥