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If anybody asks what Sufism is, what kind of religion is it, the answer is that Sufism is the religion of the heart, the religion in which the thing of primary importance is to seek God in the heart of mankind.

Hazrat Inayat Khan (1960). “The Sufi Message of Hazrat Inayat Khan: The Unity of Religious Ideals”, p.16, Library of Alexandria
If anybody asks what Sufism is, what kind of religion is it, the answer is that Sufism is the religion of the heart, the religion in which the thing of primary importance is to seek God in the heart of mankind.