What is the biblical basis for the Holy Ghost revealing truth privately and personally in an absolute and unmistakable manner?

I understand this belief is held by The Church of Jesus Christ of Latter-day Saints, as indicated by the following quote: > This is the true, solid evidence of religious faith. Millions upon millions of Latter-Day Saints attest to the power of this principle: when you go to God in prayer, asking if this thing that purports to be from Him is true, he does answer. **It is a distinctive and unmistakable experience**, and once you have received a confirmation of the truth from God, any earthly evidence pales by comparison. **People can make mistakes, but the witness of the Holy Ghost is powerful and absolute**. > > Source: [According to Latter-day Saints, should every honest, rational, and well-informed individual be able to reach the conclusion that Mormonism is true?](https://christianity.stackexchange.com/a/99550/61679) However, I'm curious to explore whether Christians outside of the LDS faith hold comparable beliefs: 1. Are Latter-day Saints unique in their belief in "unmistakable" and "absolute" personal revelatory experiences by the Holy Ghost? 2. Do Christians from other denominations maintain similar beliefs, albeit with nuances, and if so, what are these nuances? 3. What is a purely biblical basis for this belief, if any?