Srimad Bhagavad-Gita :
Chapter-12. ( Bhakti-yogam)
Slokam-s - 6 & 7.
ye tu sarvani karmani mayi sanyasya matparah,
ananyenaiva yogena mam dhyayanta upasate.
tu ye = but one who;
sarvani karmani = all karma-s;
mayi sanyasya = submit / surrender unto Me;
mat-parah = being unto Me as the Supreme Goal;
ananyena eva yogena = without distraction, fixing his mind, on that goal only;
mam dhyayanta upasate = meditate that Supreme goal;
teṣham aham samuddharta mṛtyusamsarasagarat,
bhavami na cirat partha mayyavesitacetasam.
mayi avesita cetasam = who have their manovrutti completely based on Me;
tesham = for them;
partha! aham = hey arjuna! I;
na cirat = without delay;
mṛtyu-samsara-sagarat = from the ocean of life and death;
samuddharta bhavami = I give liberation ( from the ocean of samsaram) to them.
The conclusion is that by continuously offering their hearts and minds in uninterrupted bhakti or exclusive loving devotion to the Supreme Lord Krishna, He becomes indebted to them so much so that He personally goes and rescues them from samsara, the perpetual cycle of birth and death and promotes them to the immortal spiritual worlds to eternally share in exclusive blissful communion with Him.
Actions are of two types.
One is worldly activities undertaken to maintain and progress the material existence of the physical body such as obtaining food and shelter and material development.
The other is spiritual activities enjoined by the injunctions of the Vedic scriptures such as propitiation to the Supreme Lord, absence of violence to any living being, charity, etc. in short every act without an ulterior motive and without a hopeful gain.
Whosoever being spiritual minded without any motive except for satisfying the Supreme Lord Krishna and without any desire of seeking anything in return from Him, who offer all their activities as devotion to Him, keeping Him alone as their sole goal and in one-pointed devotion focus their meditation on Him fully while worshipping Him in all their activities such as chanting His holy names, glorifying Him, offering prayers to Him, prostrating before His deity form, hearing about His lilas or divine pastimes, enlightening others about His glories, etc. as the be all and end all of all existence itself.
To be continued ....