This is the First of the Fourteen Mindfulness Trainings of the Order of Interbeing:
Aware of the suffering created by fanaticism and intolerance, we are determined not to be idolatrous about or bound to any doctrine, theory, or ideology, even Buddhist ones. We are committed to seeing the Buddhist teachings as guiding means that help us develop our understanding and compassion. They are not doctrines to fight, kill, or die for. We understand that fanaticism in its many forms is the result of perceiving things in a dualistic and discriminative manner. We will train ourselves to look at everything with openness and the insight of interbeing in order to transform dogmatism and violence in ourselves and in the world.
Thay refers to this as “The Lions Roar” in the 1993 version of the Interbeing book a term used for proclamations of the Buddha himself or his senior disciples. This and the fact that it is the first of the fourteen mean it could be considered the most important. It sets the tone for how all the others should be interpreted.
The wording of all the trainings is evolving through time. The 1993 wording (probably a close translation of the 1960’s original) is:
Do not be idolatrous about of bound to any doctrine, theory, or ideology, even Buddhist ones. Buddhist systems of thought are guiding means; they are not absolute truth.