Hinduism, which is the most skeptical and the most believing of all, the most skeptical because it has questioned and experimented the most, the most believing because it has the deepest experience and the most varied and positive spiritual knowledge, — that wider Hinduism which is not a dogma or combination of dogmas but a law of life, which is not a social framework but the spirit of a past and future social evolution, which rejects nothing but insists on testing and experiencing everything and when tested and experienced turning it to the soul's uses, in this Hinduism we find the basis of the future world-religion.
This Sanatana Dharma has many scriptures, Veda, Vedanta, Gita, Upanishad, Darshana, Purana, Tantra, nor could it reject the Bible or the Koran; but its real, most authoritative scripture is in the heart in which the Eternal has His dwelling. It is in our inner spiritual experiences that we shall find the proof and source of the world's Scriptures, the law of knowledge, love and conduct, the basis and inspiration of Karmayoga.
Sri Aurobindo Ghose
(Source: Aurobindo’s Karmayogin: Political Writings And Speeches - 1909-1910: Chapter: The Ideal of Karmayogin)