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Śrīmad-Bhāgavatam
[Canto 7, Ch. 15]
lakṣayitvā gṛhī spaṣṭam sannyased avicārayan
In this world of duality, family life is the cause that spoils one's spiritual life or meditation. Specifically understanding this fact, one should accept the order of  sannyāsa  without hesitation.
TEXT 31
देशे शुचौ समे राजन्संस्थाप्यासनमात्मनः । स्थिरं सुखं समं तस्मिन्नासीतर्ज्वङ्गं श्रोमिति ॥३१॥
deśe śucau same rājan saṁsthāpyāsanam ātmanaḥ sthiraṁ sukhaṁ samaṁ tasminn āsūtarjv-aṅga om iti
deśe —in a place;  śucau —very sacred;  same —level;  rājan —O King;  saṁsthāpya —placing;  āsanam —on the seat;  ātmanaḥ —one's self;  sthiram —very steady;  sukham —comfortably;  samam —equipoised;  tasmin —on that sitting place;  āsūta —one should sit down;  rju-aṅgaḥ —the body perpendicularly straight;  om —The Vedic  mantra praṇava ;  iti —in this way.
TRANSLATION
My dear King, in a sacred and holy place of pilgrimage one should select a place in which to perform yoga. The place must be level and not too high or low. There one should sit very comfortably, being steady and equipoised, keeping his body straight, and thus begin chanting the Vedic  praṇava .
PURPORT
Generally the chanting of  om  is recommended because in the beginning one cannot understand the Personality of Godhead. As stated in Śrīmad-Bhāgavatam (1.2.11):
vadanti tat tattva-vidas tattvaṁ yaj jñānam advayam