65. prasade sarvaduhkhanam hanir asyo 'pajayate
prasannacetaso hy asu buddhih paryavatisthath
(65) And in that purity of spirit, there is produced for him an end of all sorrow; the intelligence of such a man of pure spirit is soon established (in the peace of the self).
66 na 'sti buddhir ayuktasya na ca 'yuktasya bhavana
na ca ' bhavayata saunter ageintasya kutah sukham
(66) For the uncontrolled, there is no intelligence; nor for the uncontrolled is there the power of concentration and for him without concentration, there is no peace and for the unpeaceful, how can there be happiness?
67. indriyanam hi caratãh
yan meno 'nuvidhiyate
tad asya harati prajna
vãyur naval iva 'mbhasi
(67) When the mind runs after the roving senses, it carries away the understanding, even as a wind carries away a ship on the waters
68. tasmad asya mahabaho nigrhitam sarvasah
indriyayci 'ndriyarthebhyas tasya prajna pratisthita
(68) Therefore, 0 Mighty-armed (Arjuna), he whose senses are all withdrawn from their objects his intelligence is firmly set.
69. yd nisa sarvabhutanam tasyam jagarti samyamti
yasyarn jagrati bhutani sa nisa pagyato muneh
(69) What is night for all beings is the time of waking for the disciplined soul; and what is the time of waking for all beings is night for the sage who sees (or the sage of vision) When all beings are attracted by the glitter of sense-objects, the sage is intent on understanding reality. He is wakeful to the nature of reality to which the unwise is asleep or indifferent. The life of opposites which is the day or condition of activity for the unenlightened is night, a darkness of the soul to the wise. Cp. Goethe : "Error stands in the same relation to truth as sleeping to waking."