The secret of karma yoga which is to perform actions without any fruitive desires is taught by Lord Krishna in the Bhagavad-Gita.
Swami VivekanandaThe body is the external coating and the mind is the internal coating of the Atman who is the real perceiver, the real enjoyer, the being in the body who is working the body by means of the internal organ or the mind.
Swami VivekanandaThe weak have no place here, in this life or any other life. Weakness leads to slavery. Weakness leads to all kinds of misery, physical and mental. Weakness is death.
Swami VivekanandaEvery idea that strengthens you must be taken up and every thought that weakens you must be rejected.
Swami VivekanandaWe get caught. How? Not by what we give but by what we expect. We get misery in return for our love: not from the fact that we love but from the fact that we want love in return. There is no misery where there is no want. Desire, want, is the father of all misery. Desires are bound by the laws of success and failure. Desires must bring misery.
Swami Vivekananda