Uniting firmly the senses and the mind with gaze fixed inwards, one should, in the silent hours of evening or those before dawn, fix his mind upon the understanding.
मनसश्चेन्द्रियाणां च कृत्वैकाम्यं समाहितः। पूर्वरात्रापरार्धं च धारयेन्मन आत्मनि॥