Text 7

jitatmanah prashantasya
paramatma samahitah
sitosna-sukha-duhkhesu
tatha manapamanayoh

Translation

For one who has conquered the mind, the Supersoul is already reached, for he has attained tranquillity. To such a man happiness and distress, heat and cold, honor and dishonor are all the same. 

Commentary by Srila Prabhupada 

Actually, every living entity is intended to abide by the dictation of the Supreme Personality of Godhead, who is seated in everyone’s heart as Paramatma. When the mind is misled by the external, illusory energy, one becomes entangled in material activities. Therefore, as soon as one’s mind is controlled through one of the yoga systems, one should be considered to have already reached the destination. One has to abide by superior dictation. When one’s mind is fixed on the superior nature, he has no alternative but to follow the dictation of the Supreme. The mind must admit some superior dictation and follow it. The effect of controlling the mind is that one automatically follows the dictation of the Paramatma, or Supersoul. Because this transcendental position is at once achieved by one who is in Krishna consciousness, the devotee of the Lord is unaffected by the dualities of material existence, namely distress and happiness, cold and heat, etc. This state is practical samadhi, or absorption in the Supreme.

Commentary by Sri Visvanatha Cakravarti Thakur

Three verses show the qualities of the person who has attained steady meditation (yogarudha). The yogi who has controlled the mind (jitatmanah), who is devoid of attachment to objects (prasantasya), has his soul (atma) completely (param) situated in samadhi (samahitah), in all conditions of duality, heat and cold, happiness and distress, respect and disrespect.