The Blessed Lord said: 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.
But those who fully worship the unmanifested, that which lies beyond the perception of the senses, the all-pervading, inconceivable, fixed and immovable--the impersonal conception of the Absolute Truth--by controlling the various senses and being equally disposed to everyone, such persons, engaged in the welfare of all, at last achieve Me.
For those whose minds are attached to the unmanifested, impersonal feature of the Supreme, advancement is very troublesome. To make progress in that discipline is always difficult for those who are embodied.
For one who worships Me, giving up all his activities unto Me and being devoted to Me without deviation, engaged in devotional service and always meditating upon Me, who has fixed his mind upon Me, O son of Prtha, for him I am the swift deliverer from the ocean of birth and death.
Just fix your mind upon Me, the Supreme Personality of Godhead, and engage all your intelligence in Me. Thus you will live in Me always, without a doubt.
My dear Arjuna, O winner of wealth, if you cannot fix your mind upon Me without deviation, then follow the regulated principles of bhakti-yoga (the devotional practices). In this way you will develop a desire to attain to Me.
If you cannot practice the regulations of bhakti-yoga, then just try to work for Me, because by working for Me you will come to the perfect stage.
If, however, you are unable to work in this consciousness, then try to act giving up all results of your work and try to be self-situated.
If you cannot take to this practice, then engage yourself in the cultivation of knowledge. Better than knowledge, however, is meditation, and better than meditation is renunciation of the fruits of action, for by such renunciation one can attain peace of mind.
Also read these beautiful posts relating to Gita from my beloved friend Mark Walter :: Its all the same and also a post on Bhagavad Gita