The Masses will be Raised when we Develop Faith in The Equality and Oneness of Man

Too much of inactivity, too much of weakness, too much of hypnotism has been and is upon our race. O ye modern Hindus, de - hypnotise yourselves. The way to do that is found in your own sacred books. Teach yourselves, teach every one his real nature, call upon the sleeping soul and see how it awakes. Power will come, glory will come, goodness will come, purity will come, and everything that is excellent will come when this sleeping soul is roused to self - conscious activity. Ay, if there is anything in the Gita that I like, it is these two verses, coming out strong as the very gist, the very essence, of Krishna's teaching --"He who sees the Supreme Lord dwelling alike in all beings, the Imperishable in things that perish, he sees indeed. For seeing the Lord as the same, everywhere present, he does not destroy the Self by the Self, and thus he goes to the highest goal."
CW: Vol.3:  Lectures from Colombo to Almora: The Mission of the Vedanta (p.192.194)

I am no preacher of any momentary social reform. I am not trying to remedy evils, I only ask you to go forward and to complete the practical realisation of the scheme of human progress that has been laid out in the most perfect order by our ancestors. I only ask you to work to realise more and more the Vedantic ideal of the solidarity of man and his inborn divine nature.
Ibid.:  (p.196)

That is what we want, and that can only be created, established, and strengthened by understanding and realising the ideal of the Advaita, that ideal of the oneness of all.
Ibid.:  (p.190)

Ay, let every man and woman and child, without respect of caste or birth, weakness or strength, hear and learn that behind the strong and the weak, behind the high and the low, behind every one, there is that Infinite Soul, assuring the infinite possibility and the infinite capacity of all to become great and good. Let us proclaim to every soul: [Sanskrit]-- arise, awake, and stop not till the goal is reached. Arise, awake! Awake from this hypnotism of weakness. None  is really weak; the soul is infinite, omnipotent, and omniscient. Stand up, assert yourself, proclaim the God within you, do not deny Him!
Ibid.:  (p.193)

This wonderful idea of the sameness and omnipresence of the Supreme Soul has to be preached for the amelioration and elevation of the human race here as elsewhere. Wherever there is evil and wherever there is ignorance and want of knowledge, I have found out by experience that all evil comes, as our scriptures say, relying upon differences, and that all good comes from faith in equality, in the underlying sameness and oneness of things. This is the great Vedantic ideal.
Ibid.:  (p.194)

Even the least thing well done brings marvellous results; therefore let everyone do what little he can. If the fisherman thinks that he is the Spirit, he will be a better fisherman; if the student thinks he is the Spirit, he will be a better student. If the lawyer thinks that he is the Spirit, he will be a better lawyer, and so on, and the result will be that the castes will remain for ever. It is in the nature of society to form itself into groups; and what will go will be these privileges. Caste is a natural order; I can perform one duty in social life, and you another; you can govern a country, and I can mend a pair of old shoes, but that is no reason why you are greater than I, for can you mend my shoes? Can I govern the country? I am clever in mending shoes, you are clever in reading Vedas, but that is no reason why you should trample on my head. Why if one commits murder should he be praised, and if another steals an apple why should he be hanged? This will have to go. Caste is good. That is the only natural way of solving life. Men must form themselves into groups, and you cannot get rid of that. Wherever you go, there will be caste. But that does not mean that there should be these privileges. They should be knocked on the head. If you teach Vedanta to the fisherman, he will say, I am as good a man as you; I am a fisherman, you are a philosopher, but I have the same God in me as you have in you. And that is what we want, no privilege for any one, equal chances for all; let every one be taught that the divine is within, and every one will work out his own salvation.
Ibid.:  Vedanta in its application to India Life(p.245-246)

The other great idea that the world wants from us today, the thinking part of Europe, nay, the whole world -- more, perhaps, the lower classes than the higher, more the masses than the cultured, more the ignorant than the educated, more the weak than the strong -- is that eternal grand idea of the spiritual oneness of the whole universe. I need not tell you today, men from Madras University, how the modern researches of the West have demonstrated through physical means the oneness and the solidarity of the whole universe; how, physically speaking, you and I, the sun, moon, and stars are but little waves or wavelets in the midst of an infinite ocean of matter; how Indian psychology demonstrated ages ago that, similarly, both body and mind are but mere names or little wavelets in the ocean of matter, the Samashti; and how, going one step further, it is also shown in the Vedanta that behind that idea of the unity of the whole show, the real Soul is one. There is but one Soul throughout the universe, all is but One Existence. This great idea of the real and basic solidarity of the whole universe has frightened many, even in this country. It even now finds sometimes more opponents than adherents. I tell you, nevertheless, that it is the one great life - giving idea which the world wants from us today, and which the mute masses of India want for their uplifting, for none can regenerate this land of ours without the practical application and effective operation of this ideal of the oneness of things.
Ibid.: Lectures from Colombo to Almora: The Mission of the Vedanta (p.188)