Complete works of Swami Vivekananda is the collection of his entire works. There are 10 volumes. It also contains the life and teachings of Sri Ramakrishna Paramhansa.
Following is the extract from Vol 2:
"This Âtman is first to be heard of." Hear day and night that you are that Soul. Repeat it to yourselves day and night till it enters into your very veins, till it tingles in every drop of blood, till it is in your flesh and bone. Let the whole body be full of that one ideal, "I am the birthless, the deathless, the blissful, the omniscient, the omnipotent, ever-glorious Soul." Think on it day and night; think on it till it becomes part and parcel of your life. Meditate upon it, and out of that will come work. "Out of the fullness of the heart the mouth speaketh," and out of the fullness of the heart the hand worketh also. Action will come. Fill yourselves with the ideal; whatever you do, think well on it. All your actions will be magnified, transformed, deified, by the very power of the thought. If matter is powerful, thought is omnipotent. Bring this thought to bear upon your life, fill yourselves with the thought of your almightiness, your majesty, and your glory. Would to God no superstitions had been put into your head! Would to God we had not been surrounded from our birth by all these superstitious influences and paralysing ideas of our weakness and vileness! Would to God that mankind had had an easier path through which to attain to the noblest and highest truths! But man had to pass through all this; do not make the path more difficult for those who are coming after you.
Source: The Complete Works of Swami Vivekananda - Volume 2