Let us look at a verse in the Bhagwad Geeta where Shri Krishna explains about YOGA to Arjun.
yoga-sthaḥ kuru karmāṇi
saṅgaṁ tyaktvā dhanañjaya
siddhy-asiddhyoḥ samo bhūtvā
samatvaṁ yoga ucyate
He tells that one should be committed to Yoga. One should not think about the success or the failure but should perform his duty with full commitment. It means to concentrate one’s mind on the Supreme by controlling the ever disturbing senses. Such balanced state of mind is known as Yoga.
Let’s look at another verse which is as follows:
dūreṇa hy avaraṁ karma
buddhau śaraṇam anviccha
He tells that we must get rid of all the fruitive activities and must perform devotional service and must surrender unto him. This is the right course of action that must be undertaken by every living entity.
He further explains that those who do not use their money and resources for the service of the Lord are misers. They want to enjoy their fruits of action either earned by their good fortune or hard labour and therefore are always entangled in the cycle of birth or death.
One more verse goes like this:
tasmād yogāya yujyasva
yogaḥ karmasu kauśalam
He tells that every living entity has been suffering various reactions of both their good as well as bad work and have thus become ignorant of their true personality. This ignorance can be removed by understanding Bhagwad Geeta and a person can be relieved from the cycle of birth and death. This can be achieved by Yoga which is the art of all work.
Therefore Shri Krishna tells Arjun to strive for Yoga and to surrender himself fully to Krishna consciousness.