Man consists of Atman, mind and body. The Atman has two aspects, changeless and changing. The latter is called the world and the former God. World also is nothing but God in manifestation. God in movement is the world. Not that the world does not exist, it has a relative existence.
Atman is all-pervading, all-blissful, all-powerful, all-knowing, eternally perfect and pure. It assumes these names and forms called the world (Nama Rupa Jagat) of its own free will. There is no desire, because there is no outside object. This will is called Shakti. It is Atman in action. In Nirguna Atman, the Shakti is static. In Saguna, it is dynamic. Atman has no desire, because it is perfect, and because there is nothing which is objective to the Atman. Desire implies attraction, which presupposes imperfection. It is the very negation of will which is decision for action from within. The Atman wills and the universe comes into being. The will of the Atman upholds and governs the universe. Human beings are driven hither and thither by egoism, desires and fears due to identification with the limiting adjunct of mind and body. This idea of limitation is called egoism.
The realisation of oneness in all existences, manifested and unmanifested, is the goal of human life. This unity already exists. We have forgotten it through ignorance. The removal of this veil of ignorance, the idea that we are confined within the mind and the body, is our chief effort in Sadhana. It logically follows that to realise unity, we must give up diversity. We must constantly keep up the idea that we are all-pervading, all-powerful, etc. There is no room here for desire because in unity there is no emotional attraction, but steady, persistent, calm, eternal bliss. Desire for liberation is terminological inexactitude. Liberation means attainment of the state of infinity. It already exists. It is our real nature. There can be no desire for a thing which is your very nature. All desires for progeny, wealth, happiness in this world or in the next and lastly even the desire for liberation should be completely annihilated and all actions guided by pure and disinterested will towards the goal.
This Sadhana-the constant attempt to feel that you are the all-can be practised or rather ought to be practised in the midst of intense activity. That is the central teaching of the Gita. It stands to reason also. Because God is both Saguna and Nirguna, with form and without form. Let the mind and the body work. Feel that you are above them, their controlling witness. Do not identify yourself with the Adhara (support for mind and body), even when it is employed in activity. Of course meditation in the beginning has to be resorted to. Only an exceptionally strong-willed man can dispense with it. For ordinary human beings, it is an indispensable necessity. In meditation, the Adhara is steady. So the Sadhana, the effort to feel Unity is comparatively easy. In the midst of activities, this effort is difficult. Karma Yoga is more difficult than pure Jnana Yoga. We must, however, keep up the practice at all times. That is absolutely essential, otherwise the progress is slow; because, a few hours' meditation on the idea that you are the all and identification with mind and body for a greater portion of the day, do not bring about rapid or substantial advance.
It is much better to associate the word-symbol, OM, with the idea. From time immemorial, this symbol has been used for expressing the idea of unity. So the best method is to repeat this word OM and meditate on its meaning at all times. But we must set apart some hours for meditation, pure and simple, in the morning and in the evening.