Did Buddha teach that the many was real and the ego unreal, while orthodox Hinduism regards the One as the real, and the many as unreal?" the Swami was asked. "Yes", answered the Swami. "And what Ramakrishna Paramahamsa and I have added to this is, that the Many and the One are the same Reality, perceived by the same mind at different times and in different attitudes.
Swami VivekanandaThere is the mind itself. It is like a smooth lake which when struck, say by a stone, vibrates. The vibrations gather together and react on the stone, and all through the lake they will spread and be felt. The mind is like the lake; it is constantly being set in vibrations, which leave an impression on the mind; and the idea of the Ego, or personal self, the "I", is the result of these impressions. This "I" therefore is only the very rapid transmission of force and is in itself no reality.
Swami VivekanandaAs soon as we identify ourselves with the work we do, we feel miserable; but if we do not identify ourselves with it, we do not feel that misery.
Swami VivekanandaOur misery comes, not from work, but by our getting attached to something. Take for instance, money: money is a great thing to have, earn it, says Krishna; struggle hard to get money, but don't get attached to it. So with children, with wife, husband, relatives, fame, everything; you have no need to shun them, only don't get attached. There is only one attachment and that belongs to the Lord, and to none other.
Swami Vivekananda