Srimad-Bhagavad-Gita
SECOND CHAPTER — Sanjaya said:

51. The wise, possessed of this evenness of mind, abandoning the fruits of their actions, freed for ever from the fetters of birth, go to that state which is beyond all evil.

52. When thy intellect crosses beyond the taint of illusion, then shalt thou attain to indifference, regarding things heard and things yet to be heard.

53. When thy intellect, tossed about by the conflict of opinions--has become immovable and firmly established in the Self, then thou shalt attain Self-realisation.

Arjuna said:

54. What, O Keshava, is the description of the man of steady wisdom, merged in Samadhi? How (on the other hand) does the man of steady wisdom speak, how sit, how walk?

The Blessed Lord said:

55. When a man completely casts away, O Partha, all the desires of the mind, satisfied in the Self alone by the Self, then is he said to be one of steady wisdom.

56. He whose mind is not shaken by adversity, who does not hanker after happiness, who has become free from affection, fear, and wrath, is indeed the Muni of steady wisdom.

57. He who is everywhere unattached, not pleased at receiving good, nor vexed at evil, his wisdom is fixed.

58. When also, like the tortoise its limbs, he can completely withdraw the senses from their objects, then his wisdom becomes steady.

59. Objects fall away from the abstinent man, leaving the longing behind. But his longing also ceases, who sees the Supreme.

60. The turbulent senses, O son of Kunti, do violently snatch away the mind of even a wise man, striving after perfection.

61. The steadfast, having controlled them all, sits focussed on Me as the Supreme. His wisdom is steady, whose senses are under control.

62. Thinking of objects, attachment to them is formed in a man. From attachment longing, and from longing anger grows.

63. From anger comes delusion, and from delusion loss of memory. From loss of memory comes the ruin of discrimination, and from the ruin of discrimination he perishes.

64. But the self-controlled man, moving among objects with senses under restraint, and free from attraction and aversion, attains to tranquillity.

65. In tranquillity, all sorrow is destroyed. For the intellect of him who is tranquil-minded, is soon established in firmness.

66. No knowledge (of the Self) has the unsteady. Nor has he meditation. To the unmeditative there is no peace. And how can one without peace have happiness?

67. For, the mind which follows in the wake of the wandering senses, carries away his discrimination, as a wind (carries away from its course) a boat on the waters.

68. Therefore, O mighty-armed, his knowledge is steady, whose senses are completely restrained from their objects.

69. That which is night to all beings, in that the self-controlled man wakes. That in which all beings wake, is night to the Self-seeing Muni.