Bhagavad Gita Verse 2, Chapter 6

yam sannyaasamiti praahuryogam tam viddhi paandava |
na hyasannyastasankalpo yogi bhavati kashchana | |2||
 
In this manner, that which is called renunciation, know that to be the same as yoga, O Paandava. For without renunciation of desires, one cannot become a yogi.
 
yam : that which
sannyaasam : renunciation
iti : in this manner
praahuhu : call
yogam : yoga
tam : that same thing
viddhi : know that
paandava : O Paandava
na : not
hi : for
asannyasta : without renouncing
sankalpo : desires
yogi : yogi
bhavati : become
kashchana : cannot|
 
Shri Krishna further elaborates on the definition of a sannyaasi or a monk in this shlokla. He says that the karmayogi and sannyaasi are, at their core, one and the same. One need not renounce the world in order to become a dhyaana yogi or a meditator. All one needs to do is to follow the path of karmayoga diligently. Only when the tendency to create new desires or sankalpa goes away can one become a meditator.
 
How can the action-oriented karmayogi and the actionless-oriented monk be the same? Let us investigate. It is only when the mind of the seeker is free of sankalpa does he become ready for meditation. Meditation can occur only when the mind is tranquil. Tranquility only occurs when the mind is rid of all desires. Now the question arises that how do we know whether such tranquility exists? Have we experienced it? Yes we have. Once we finally get an object that we were craving for a long time, our mind experiences tranquility for a fraction of a second. This is caused due to a temporary cessation of desires, and ends when new desires start agitating the mind again.
 
If one has reached an advanced stage in the spiritual journey where desires have gone down to a minimum, one becomes actionless automatically. We saw this in the fifth chapter. But if one still harbours desires, karmayoga is the means to slowly diminish desires through renouncing the results of action. So what needs to be renounced is attachment to results of action, not action itself. This recurring message drives home the point that action-orientation and actionless-orientation are the same, as long as the attachment to results is renounced. They both have the same effect: tranquility of mind.