'Each soul is potentially divine. The goal is to manifest this divine within, by controlling nature, external and internal. Do this either by work, or worship, or psychic control, or philosophy, by one, or more, or all of these and be free.' - said Swami Vivekananda
Bhakti Yoga is for those who are dualists, or qualified monists. Jnana Yoga is for the monists. Karma Yoga is not an altogether independent method; it is connected with Bhakti and Jnana in the beginning and it is practised also after the realization of the goal. For Karma, or works, serve as a method of self-purification and illumined souls also do work for the good of humanity. Raja Yoga, as a method of training the mind for concentration, forms a part of all Yogas, though it itself is an independent philosophical system and method of spiritual practice.
While dealing with these Yogas, though Swami Vivekananda did not essentially deviate from the orthodox schools, he, however, always added something of his own, threw new light on the old systems, and interpreted the ancient ideas in modern living language. That is why his discourses on the Yogas, as also on other subjects, are so interesting, inspiring, and appealing to modern minds.
To attain to the highest experience, an aspirant has to try to live that idea in his words, thoughts, and deeds. From that principle Swami Vivekananda builds up his idea of practical Vedanta. Man should always try to practise the idea that he is divine 'I am He' or 'Thou art That.' If one constantly remembers that idea, one will manifest great energy, strength, power and perfection. It will not be a case of inflating the ego, which is pseudo-monism. It will be a case of penetrating into one's depth of being, and feeling that all power is within, though not perceived by ordinary persons. Through practice one will find the two selves in oneself - the real self and the apparent self. Even if one does not experience that real self, it is there within one, just as shadows point to the substance. So always fall back upon your source of strength, and cease wailing in weakness and despair.