From My Spiritual Diary-59: "The Spirit of Vedanta"

…I came here to represent a philosophy of India, which is called the Vedanta philosophy. This philosophy is very, very ancient; it is the outcome of that mass of ancient Aryan literature known by the name of the Vedas. It is, as it were, the very flower of all the speculations and experiences and analyses, embodied in that mass of literature — collected and culled through centuries. This Vedanta philosophy has certain peculiarities. In the first place, it is perfectly impersonal; it does not owe its origin to any person or prophet: it does not build itself around one man as a centre. Yet it has nothing to say against philosophies which do build themselves around certain persons. In later days in India, other philosophies and systems arose, built around certain persons — such as Buddhism, or many of our present sects. They each have a certain leader to whom they owe allegiance, just as the Christians and Mohammedans have. But the Vedanta philosophy stands at the background of all these various sects, and there is no fight and no antagonism between the Vedanta and any other system in the world.

One principle it lays down — and that, the Vedanta claims, is to be found in every religion in the world — that man is divine, that all this which we see around us is the outcome of that consciousness of the divine. Everything that is strong, and good, and powerful in human nature is the outcome of that divinity, and though potential in many, there is no difference between man and man essentially, all being alike divine. There is, as it were, an infinite ocean behind, and you and I are so many waves, coming out of that infinite ocean; and each one of us is trying his best to manifest that infinite outside. So, potentially, each one of us has that infinite ocean of Existence, Knowledge, and Bliss as our birthright, our real nature; and the difference between us is caused by the greater or lesser power to manifest that divine. Therefore the Vedanta lays down that each man should be treated not as what he manifests, but as what he stands for. Each human being stands for the divine, and, therefore, every teacher should be helpful, not by condemning man, but by helping him to call forth the divinity that is within him.

It also teaches that all the vast mass of energy that we see displayed in society and in every plane of action is really from inside out; and, therefore, what is called inspiration by other sects, the Vedantist begs the liberty to call the expiration of man. At the same time it does not quarrel with other sects; the Vedanta has no quarrel with those who do not understand this divinity of man. Consciously or unconsciously, every man is trying to unfold that divinity.

Man is like an infinite spring, coiled up in a small box, and that spring is trying to unfold itself; and all the social phenomena that we see the result of this trying to unfold. All the competitions and struggles and evils that we see around us are neither the causes of these unfoldments, nor the effects. As one of our great philosophers says — in the case of the irrigation of a field, the tank is somewhere upon a higher level, and the water is trying to rush into the field, and is barred by a gate. But as soon as the gate is opened, the water rushes in by its own nature; and if there is dust and dirt in the way, the water rolls over them. But dust and dirt are neither the result nor the cause of this unfolding of the divine nature of man. They are coexistent circumstances, and, therefore, can be remedied.

….There are moments when every man feels that he is one with the universe, and he rushes forth to express it, whether he knows it or not. This expression of oneness is what we call love and sympathy, and it is the basis of all our ethics and morality. This is summed up in the Vedanta philosophy by the celebrated aphorism, Tat Tvam Asi, "Thou art That".

To every man, this is taught: Thou art one with this Universal Being, and, as such, every soul that exists is your soul; and every body that exists is your body; and in hurting anyone, you hurt yourself, in loving anyone, you love yourself. As soon as a current of hatred is thrown outside, whomsoever else it hurts, it also hurts yourself; and if love comes out from you, it is bound to come back to you. For I am the universe; this universe is my body. I am the Infinite, only I am not conscious of it now; but I am struggling to get this consciousness of the Infinite, and perfection will be reached when full consciousness of this Infinite comes.

Another peculiar idea of the Vedanta is that we must allow this infinite variation in religious thought, and not try to bring everybody to the same opinion, because the goal is the same. As the Vedantist says in his poetical language, "As so many rivers, having their source in different mountains, roll down, crooked or straight, and at last come into the ocean — so, all these various creeds and religions, taking their start from different standpoints and running through crooked or straight courses, at last come unto THEE."

…This is one of the great lessons that the Vedanta has to teach. Knowing that, consciously or unconsciously, we are struggling to reach the same goal, why should we be impatient? If one man is slower than another, we need not be impatient, we need not curse him, or revile him. When our eyes are opened and the heart is purified, the work of the same divine influence, the unfolding of the same divinity in every human heart, will become manifest; and then alone we shall be in a position to claim the brotherhood of man.

When a man has reached the highest, when he sees neither man nor woman, neither sect nor creed, nor colour, nor birth, nor any of these differentiations, but goes beyond and finds that divinity which is the real man behind every human being …

Excerpt from the Complete Works of Swami Vivekananda