Bhakti Yoga-Bhagavad Gita Chapter 12 [The Path of Devotion]
Krishna Said > Shaloka: 2
He whose mind is fixed on My personal form, always engaged in worshiping Me with great and transcendental faith, is considered by Me to be most perfect.
In answer to Arjuna’s question, Krishna clearly says that he who concentrates upon His personal form and who worships Him with faith and devotion is to be considered most perfect in yoga. For one in such Krishna consciousness there are no material activities because everything is done by Krishna. A pure devotee is constantly engaged. Sometimes he chants, sometimes he hears or reads books about Krishna, or sometimes he cooks prasadam or goes to the marketplace to purchase something for Krishna, or sometimes he washes the temple or the dishes–whatever he does, he does not let a single moment pass without devoting his activities to Krishna. Such action is in full samadhi.