The word 'Yoga' is derived from the Sanskrit root 'Yuj', meaning 'to join' or 'to yoke' or 'to unite'.
"Yoga is the very dexterity of work" P 37.
2.11 Keeping the mind constant in all eventualities is the way of the wise. He who harmonizes his thought, word and deed verily gets into yoga.
2-45 "Even mindedness is yoga".
Yoga = bringing harmony between mind and body.
2-48 Perform action, O Dhananjaya, being fixed in yoga, renouncing attachments, and even-minded in success and failure; equilibrium is verily yoga.
बुद्धियुक्तो जहातीह उभे सुकृतदुष्कृते । तस्माद्योगाय युज्यस्व योगः कर्मसु कौशलम् ॥ २-५०॥ 2-50. The one fixed in equanimity of mind frees oneself in his life from vice and virtue alike; therefore devote yourself to yoga; work done to perfection is verily yoga.
2-50 ‘योग: कर्मसु कौशलम्’ 1. कर्मसु कौशलं योग: Efficiency in actions is yoga. २. कर्मसु योग: कौशलम् Yoga is skillful in actions.
2-53. When mentation विचार-प्रक्रिया ceases in equilibrium = Samadhi or Spiritual Illumination. Atman in Its original Splendor is then realized. Yoga reaches its culmination here. This state of pure-Conscious is the goal of life.
18-78 Yoga is union between the Divine and the human.
8-09 & 8-10 Prana or life-energy of the ordinary man leaves the body at death through the apertures. But it goes out differently when the yogi departs from the body. It gets concentrated between the eye-brows and exits through the skull. This last event is also the outcome of the strength of yoga.
6-36. Yoga is hard to attain, I concede, by a man who cannot control himself; but it can be attained by him who has controlled himself and who strives by right means.
6-23 The meaning of yoga is to yoke one with one's supreme nature.
6-18 Possession of the mind in its entirety is yoga. ---- Sri Ramakrishna
6-02. Sankalpa (Resolution) = selfish motive behind an action. Sanyasa is the renunciation of sankalpa. Strength of mind is his who practises yoga. Only a man of strong mind can meditate as well as discharge his duties very efficiently. This is how sankalpa sanyasa = karma yoga .
4-28 Acquiring wealth by honest means and utilizing it for the public weal, is a form of Yajna.