How to explain the three stages of Knowledge, Devotion and Practice in Pravritti and Nivritti separately?

Swami replied (on phone): Knowledge, Devotion and Practice is a general formula that can be applied to even the matters of Pravritti. If you study in an institution, its merits will attract you to join the institution. Then, you will take up all the practical processes of admission. Studying merits and defects is knowledge. Attraction by the merits is  theoretical devotion. Then, practical admission is practice. Actually, these three steps are very much concerned with God. Studying the details of God is the first step (Knowledge). Developing attraction or devotion to God based on the knowledge of God is the second step. In the third step called practice, service to God’s work and sacrifice of the fruit of work are done. Even in Pravritti, there is always some sort of Nivritti because every soul wants to protect his/her Pravritti with the Grace of God. Therefore, he worships God, which is Nivrutti. These three steps in Pravritti are polluted by selfish worldly desires. In Nivritti, the same three steps are to be done with just one modification, which is that in all the three steps, aspiration for any fruit in return should be totally absent.