Teachings
In The Spiritual Message of Hazrat Inayat Khan, Volume I - The Way of Illumination, Hazrat Inayat Khan set forth ten thoughts that form the foundational principles of Universal Sufism:

1. There is One God, the Eternal, the Only Being; None exists save He. ... (alternative, source unknown) There is One God, the Eternal, the Only Being; None exists save God.
2. There is One Master, the Guiding Spirit of all souls, Who constantly leads all followers toward the Light.
3. There is One Holy Book, the Sacred Manuscript of Nature, the only Scripture that can enlighten the reader.
4. There is One Religion, the unswerving progress in the right direction toward the Ideal, which fulfills the life's purpose of every soul.
5. There is One Law, the Law of Reciprocity, which can be observed by a selfless conscience, together with a sense of awakened justice.
6. There is One Brotherhood, the human brotherhood which unites the children of earth indiscriminately in the fatherhood of God. ... (later adapted by followers) There is one Family, the Human Family, which unites the Children of Earth indiscriminately in the Parenthood of God.
7. There is One Moral, the Love which springs forth from self-denial and blooms in deeds of beneficence.
   ... (alternative, source unknown) There is one Moral Principle, the Love which springs forth from a willing heart, surrendered in service to God and Humanity, and which blooms in deeds of beneficence.
8. There is One Object of Praise, the Beauty which uplifts the heart of its worshipper through all aspects from the seen to the unseen.
9. There is One Truth, the true knowledge of our being, within and without, which is the essence of Wisdom.