46. All purposes serves by a small well can be served at once by a great reservoir of water. Similarly, all the purposes of the Vedas can be served to the one who knows the purpose behind them.
Significance:
Reaching actual knowledge is what it is about. And actual knowledge one gets by sustained yoga. The wonderful thing about devotional service, also known as sankhya yoga and buddhi yoga, is that one can practise it always and everywhere. One can think of Krishna’s form, His pastimes, chant His names, worship the deity on the altar, think about what to cook for vegetarian dinner, visit a temple or a congregation, study the Bhagavad-Gita or the Vedanta Sutra, think of specific verses or aphorisms and their meanings, etc. etc. etc..

47. You have a right to perform your precribed duty but you’re not entitled to the fruits of action. Never consider yourself to be the cause of the fruits of your activities and never be attached to not doing your duty.
Significance:
Sometimes this may be tough, still you have to do it. And people of character simply do it, or gradually do it more and more.

48. Perform your duty equipoised, O Arjuna, abandoning all attachment to success or failure. Such equanimity is called yoga.
Significance:
Attachment to fragmented and isolated managerial and political ephemeral and ethereal so called realities is the cause of eternal bewilderment.

49. O Dhananjaya, conquerer of wealth, keep all abominable activities far distant by getting manifest your buddhi, your actual intelligence. For it is with that intelligence you are able to unite within the Supreme.
Significance:
A devotee of Krishna is automatically an actual buddhist since he has reached cessation of all material activities. Brahma-nirvana is the domain of the devotee of Krishna since he realises actual object permanence.

50. A person engaged in yoga, his buddhi engaged in relationship to Krishna, liberates himself from all good and bad result from all his activities.
Significance:
As one advances in this practical activity one gets more and more realisation of eternity. So Absolute Truth, eternity, is up for grabs, one only has to become aware of it.

51. By separating the wheat from the chaff, separating reality from shadow reality, the yogis liberate themselves from the results of work in the material world. In this way they quit the eternal cycle of birth and death and attain the state beyond all miseries.
Significance:
Repeated birth and death is part of the system of the material universe. Not engaging in spiritual life one again has to undergo it, again & again, until one has learned. There are verses in the Bhagavad-GIta, like 4.23, 5.7, 5.8, 5.13 and 13.32 that state the spirit soul doesn’t do anything. But to understand “not doing anything” one must first come to understand what “activity” actually means. Mostly people are too dull headed for that in Kali yuga, apart from not being interested in it because of having the preference of being slaves of their senses. When you are interested in coming to realise the nature of activity you’re most fortunate since you will get clear the Absolute Truth, the actual scientific reality.

52. When your intelligence has left the dense forest of delusion you become indifferent to all that has been heard and will be heard.
Significance:
Proper hearing also means having sound vision and having reached quietness and being awake. When one is awake one realises this world is a spiritual dream. So this world is completely real because it is completely spiritual. “Material” simply means being forget of God, being forgetful of the Absolute Truth.