As you know yoga is union, connection or integration between individual and the collective consciousness. This state was beautifully described in Gita, chapter 2.
54. What, O Krishna, is the description of him who has steady wisdom and is merged in the state of Sthitaprajna? How does one of steady wisdom speak? How does he sit? How does he walk?
55. When a man completely casts off, O Arjuna, all the desires of the mind and is satisfied in the Self 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 pleasures, and who is free from attachment, fear and anger, is called a sage of steady wisdom.
57. He who is everywhere without attachment, on meeting with anything good or bad, who neither rejoices nor hates, his wisdom is fixed.
58. When, like the tortoise which withdraws its limbs on all sides, he withdraws his senses from the sense-objects, then his wisdom becomes steady.
59. The objects of the senses turn away from the abstinent man, leaving the longing (behind); but his longing also turns away on seeing the Supreme.
60. The turbulent senses, O Arjuna, do violently carry away the mind of a wise man though he be striving (to control them)!
61. Having restrained them all he should sit steadfast, intent on Me; his wisdom is steady whose senses are under control.
62. When a man thinks of the objects, attachment to them arises; from attachment desire is born; from desire anger arises.
This description is in compliance with Patanjali’s “Yogas citta vrtti nirodhah”