 Evolution of mankind, new revelations about God's nature, about our destiny, and about holiness, and about the entire question of religious belief. No, I don't consider it reliable. You must have it beforehand, but Gematria does provide a confirmation. There are books published on this, and you have to know math very well. Nowadays, you must be able to use a calculator, because you've got to run off a new calculator the value of a word.