6
The Perfection of Yoga
It is not he who is speaking. He is just an instrument. The real speaker is the Supreme Personality of God-head who is both within and without. At the beginning of His discourse on the  yoga  system in the Sixth Chapter of  Bhagavad-gītā , Śrī Kṛṣṇa says:
anāśritaḥ karma-phalam karyam karma karoti yaḥ sa sannyāsī ca yogī ca na niragnir na cākriyaḥ
“One who is unattached to the fruits of his work and who works as he is obligated is in the renounced order of life, and he is the true mystic; not he who lights no fire and performs no work.” (Bg. 6.1) Everyone is working and expecting some result. One may ask what is the purpose of working if no result is expected? A remuneration or salary is always demanded by the worker. But here Kṛṣṇa indicates that one can work out of a sense of duty alone, not expecting the results of his activities. If one works in this way, then he is actually a  sannyāsī ; he is in the renounced order of life.
According to Vedic culture, there are four stages of life:  brahmacārī ,  gṛhastha ,  vānaprastha  and  sannyāsa .  Brahmacārī  is student life devoted to training in spiritual understanding.  Gṛhastha  life is married householder life. Then upon reaching the approximate age of fifty, one may take the  vānaprastha  order—that is, he leaves his home and children and travels with his wife to holy places of pilgrimage. Finally he gives up both wife and children and remains alone to cultivate Kṛṣṇa consciousness, and