“From the age of fifteen, dogma has been the fundamental principle of my religion: I know no other religion; I cannot enter into the idea of any other sort of religion; religion, as a mere sentiment, is to me a dream and a mockery.”

October 1927. The Collected Works, Volume 35, New Delhi, 1968, pp. 166-67. As quoted in Goel, S.R. History of Hindu-Christian Encounters (1996)
1920s

Letter to Kirtanananda, New York, 14 April, 1967 PrabhupadaBooks.com http://prabhupadabooks.com/letters/new_york/april/14/1967/kirtanananda?d=1
Quotes from other Sources, Quotes from other Sources: Religious and Cultural Elitism

Part II: First Day in Pretoria
1920s, An Autobiography (1927)
Context: I am a Hindu by birth. And yet I do not know much of Hinduism, and I know less of other religions. In fact I do not know where I am, and what is and what should be my belief. I intend to make a careful study of my own religion and, as far as I can, of other religions as well.

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Letter to Thomas Leiper (11 January 1809). Published in The Works of Thomas Jefferson in Twelve Volumes http://oll.libertyfund.org/ToC/0054.php, Federal Edition, Paul Leicester Ford, ed., New York: G. P. Putnam's Sons, 1904, Vol. 11 http://oll.libertyfund.org/Texts/Jefferson0136/Works/0054-11_Bk.pdf, pp. 89
1800s, Second Presidential Administration (1805-1809)

By any means necessary: speeches, interviews, and a letter (1970)

The Uttarpara Address (1909)
Context: I waited day and night for the voice of God within me, to know what He had to say to me, to learn what I had to do. In this seclusion the earliest realisation, the first lesson came to me. I remembered then that a month or more before my arrest, a call had come to me to put aside all activity, to go in seclusion and to look into myself, so that I might enter into closer communion with Him. I was weak and could not accept the call. My work was very dear to me and in the pride of my heart I thought that unless I was there, it would suffer or even fail and cease; therefore I would not leave it. It seemed to me that He spoke to me again and said, "The bonds you had not the strength to break, I have broken for you, because it is not my will nor was it ever my intention that that should continue. I have had another thing for you to do and it is for that I have brought you here, to teach you what you could not learn for yourself and to train you for my work." Then He placed the Gita in my hands. His strength entered into me and I was able to do the sadhana of the Gita. I was not only to understand intellectually but to realise what Sri Krishna demanded of Arjuna and what He demands of those who aspire to do His work, to be free from repulsion and desire, to do work for Him without the demand for fruit, to renounce self-will and become a passive and faithful instrument in His hands, to have an equal heart for high and low, friend and opponent, success and failure, yet not to do His work negligently. I realised what the Hindu religion meant. We speak often of the Hindu religion, of the Sanatan Dharma, but few of us really know what that religion is. Other religions are preponderatingly religions of faith and profession, but the Sanatan Dharma is life itself; it is a thing that has not so much to be believed as lived. This is the Dharma that for the salvation of humanity was cherished in the seclusion of this peninsula from of old. It is to give this religion that India is rising. She does not rise as other countries do, for self or when she is strong, to trample on the weak. She is rising to shed the eternal light entrusted to her over the world. India has always existed for humanity and not for herself and it is for humanity and not for herself that she must be great.

R. Tagore, `Aatmaparichapa' in his book `Parichaya' http://hindusamhati.blogspot.com/2013/05/thoughts-of-rabindranath-tagore-on.html

The Uttarpara Address (1909)
Context: That which we call the Hindu religion is really the eternal religion, because it is the universal religion which embraces all others. If a religion is not universal, it cannot be eternal. A narrow religion, a sectarian religion, an exclusive religion can live only for a limited time and a limited purpose. This is the one religion that can triumph over materialism by including and anticipating the discoveries of science and the speculations of philosophy. It is the one religion which impresses on mankind the closeness of God to us and embraces in its compass all the possible means by which man can approach God. It is the one religion which insists every moment on the truth which all religions acknowledge that He is in all men and all things and that in Him we move and have our being. It is the one religion which enables us not only to understand and believe this truth but to realise it with every part of our being. It is the one religion which shows the world what the world is, that it is the Lila of Vasudeva. It is the one religion which shows us how we can best play our part in that Lila, its subtlest laws and its noblest rules. It is the one religion which does not separate life in any smallest detail from religion, which knows what immortality is and has utterly removed from us the reality of death.

Source: The Meaning of God in Human Experience (1912), Ch. IV : The Retirement of the Intellect, p. 38.