The next is Abhyâsa, practice. The mind should always go towards God. No other things have any right to withhold it. It should continuously think of God, though this is a very hard task; yet it can be done by persistent practice. What we are now is the result of our past practice. Again, practice makes us what we shall be. So practice the other way; one sort of turning round has brought us this way, turn the other way and get out of it as soon as you can. Thinking of the senses has brought us down here — to cry one moment, to rejoice the next, to be at the mercy of every breeze, slave to everything. This is shameful, and yet we call ourselves spirits. Go the other way, think of God; let the mind not think of any physical or mental enjoyment, but of God alone. When it tries to think of anything else, give it a good blow, so that it may turn round and think of God. As oil poured from one vessel to another falls in an unbroken line, as chimes coming from a distance fall upon the ear as one continuous sound, so should the mind flow towards God in one continuous stream. We should not only impose this practice on the mind, but the senses too should be employed. Instead of hearing foolish things, we must hear about God; instead of talking foolish words, we must talk of God. Instead of reading foolish books, we must read good ones which tell of God.
The Complete Works of Swami Vivekananda/Volume 4/Addresses on Bhakti-Yoga/The Preparation