In Saiyasart a believe is the assumption or acceptance of anaudited knowledge. Believes arise from continuous external input or through continuous self-input.

A believe is opposed to verified knowledge and is used as an instrument both in different religions and in personal existence. Often the path to knowledge leads through believes. The prerequisite for this is a review of what has been adopted as supposed knowledge in order to turn a believe into knowledge.

In Saiyasart, in Pahuyuth and in the traditional Free-Warrior Medicine it is recommended to transform traditional knowledge contents into self-acquired knowledge by self-verification. For this reason, these bodies of knowledge are also referred to as truth-knowledge, fighting knowledge and medical knowledge.