The philosophy of vedanta must be very practical; and later on, when we come to the Bhagavad-Gita — most of you, perhaps, have read it, it is the best commentary we have on the Vedanta philosophy — curiously enough the scene is laid on the battlefield, where Krishna teaches this philosophy to Arjuna; and the doctrine which stands out luminously in every page of the Gita is intense activity, but in the midst of it, eternal calmness. This is the secret of work, to attain which is the goal of the Vedanta. Inactivity, as we understand it in the sense of passivity, certainly cannot be the goal. Were it so, then the walls around us would be the most intelligent; they are inactive. Clods of earth, stumps of trees, would be the greatest sages in the world; they are inactive. Nor does inactivity become activity when it is combined with passion. Real activity, which is the goal of Vedanta, is combined with eternal calmness, the calmness which cannot be ruffled, the balance of mind which is never disturbed, whatever happens. And we all know from our experience in life that that is the best attitude for work.
I have been asked many times how we can work if we do not have the passion which we generally feel for work. I also thought in that way years ago, but as I am growing older, getting more experience, I find it is not true. The less passion there is, the better we work. The calmer we are, the better for us, and the more the amount of work we can do. When we let loose our feelings, we waste so much energy, shatter our nerves, disturb our minds, and accomplish very little work. The energy which ought to have gone out as work is spent as mere feeling, which counts for nothing. It is only when the mind is very calm and collected that the whole of its energy is spent in doing good work. And if you read the lives of the great workers which the world has produced, you will find that they were wonderfully calm men. Nothing, as it were, could throw them off their balance. That is why the man who becomes angry never does a great amount of work, and the man whom nothing can make angry accomplishes so much. The man who gives way to anger, or hatred, or any other passion, cannot work; he only breaks himself to pieces, and does nothing practical. It is the calm, forgiving, equable, well-balanced mind that does the greatest amount of work.
The Vedanta preaches the ideal; and the ideal, as we know, is always far ahead of the real, of the practical, as we may call it.
Source: The Complete Works of Swami Vivekananda/Volume 2/Practical Vedanta and other lectures/Practical Vedanta: Part I