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The Holy Koran sheds light on the ultimate unity of the Truth:
In the beginning all people were of one community. Later people created different convictions and paths" (Koran 11.10). And “in the beginning people were on one Path (Koran 2.2).
In the known history of mankind, Sanatana Dharma is oldest of the major dharmas, followed by the other dharmas, for example, Judeo-Christian and Islam. Due to differences of geography, culture, and language, these religions appear to be different from one another, but in fact, they are branches of one tree. The belief in the unity of God is the great theme of the major religions.
The Rig Veda, an ancient text of Sanatana Dharma, declares:
Truth is one; sages speak of it in different ways.
The teachings of all dharmas, Vedic, Judeo-Christian, Islamic, Sikhism and other, as well as the words of the saints, great religious scholars and poets, all emphasize this fundamental oneness of Truth.
In the Katha Upanishad (5: 13) Yama explains this mystery to Nachiketas:
As the one air has entered the world and becomes varied in form corresponding to the shape of the form of every object, so the one Inner Soul of all things becomes varied according to whatever form, and also exists outside..
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