If you want to become an astronomer and sit down and cry "Astronomy! Astronomy! " it will never come to you. The same with Chemistry. A certain method must be followed. You must go to a laboratory, take different substances, mix them up, compound them, experiment with them, and out of that will come a knowledge of chemistry. If you want to be an astronomer, you must go to an
observatory, take a telescope, study the stars and planets, and then you will become an astronomer.
There is only one method by which to attain this knowledge, that which is called concentration. The chemist in the laboratory concentrates all the energies of his mind into one focus, and throws them upon the materials he is analysing, and so finds out their secrets. The astronomer concentrates all the energies of his mind and projects them through his telescope upon the skies; and the stars, the sun, and the moon, give up their secrets to him. The more I can concentrate my thoughts on the matter on which I am talking to you, the more light I can throw upon you. You are listening to me, and the more you concentrate your thoughts, the more clearly you will grasp what I have to say.
-- Swami Vivekanand