Part of the reason why the Qabalah is so important is that it is the key to understanding the Holy Books. Most of them, including The Book of the Law, are written in abstract, poetic, and often obscure language. Through the use of the Qabalah, and especially the function of gematria (a form of numerology), the normally opaque meaning of the texts can be made clear. Thelemites can also make use of gematria to link words and concepts and to validate revelations given to them in magical operations, such as astral travel.