MILLIONS OF YEARS HAVE PASSED SINCE MAN FIRST CAME HERE, AND YET BUT ONE INFINITESIMAL PART OF HIS POWERS HAS BEEN MANIFESTED.

But it is not selfish faith because the Vedanta, again, is the doctrine of oneness. It means faith in all, because you are all. Love for yourselves means love for all, love for animals, love for everything, for you are all one. It is the great faith which will make the world better. I am sure of that. He is the highest man who can say with truth, "I know all about myself." Do you know how much energy, how many powers, how many forces are still lurking behind that frame of yours? What scientist has known all that is in man? Millions of years have passed since man first came here, and yet but one infinitesimal part of his powers has been manifested. Therefore, you must not say that you are weak. How do you know what possibilities lie behind that degradation on the surface? You know but little of that which is within you. For behind you is the ocean of infinite power and blessedness.

- Swami Vivekananda
The Complete Works of Swami Vivekananda/Volume 2/Practical Vedanta and other lectures/Practical Vedanta: Part I (Delivered in London, 10th November 1896)