There have been mystics outside of Hinduism who have seen revelations that reflect Hindu beliefs. Indeed often their writings would seem to be more like Hindu writings than those of their own religion. One of those is Julian of Norwich, 1342 to 1423. In Revelations of Divine Love she wrote:
“HE [God] ALSO SHOWED ME a little thing, the size of a hazelnut, lying in the palm of my hand. It was as round as a ball, as it seemed to me. I looked at it with the eyes of my understanding and thought, “What can this be?” My question was answered in general terms in this fashion: “It is everything that is made.” I marveled at how this could be, for it seemed to me that it might suddenly fall into nothingness, it was so small. An answer for this was given to my understanding: “It lasts, and ever shall last, because God loves it. And in this fashion all things have their being by the grace of God…. It is necessary for us to know the littleness of creatures in order to reduce them to nothingness in our judgment, so that we may love and have the uncreated God. The reason we are not fully at ease in heart and soul is because we seek rest within them, and pay no attention to our God, who is Almighty, All-wise, All-good and the only real rest.”
Here are the ideas of Advaita Vedanta (God in everything), the illusion of Evil and the distraction of May from someone who had never heard of Hinduism. Note also that there is no Judgement day, the world lasts for ever. Surely this is proof of the universality of revelation and the ultimate truths in Hinduism.