From the methodological perspective, both traditions emphasize the role of empiricism. For example, in the Buddhist investigative tradition, between the three recognized sources of knowledge - experience, reason and testimony - it is the evidence of the experience that takes precedence, with reason coming second and testimony last. This means that, in the Buddhist investigation of reality, at least in principle, empirical evidence should triumph over scriptural authority, no matter how deeply venerated a scripture may be. Even in the case of knowledge derived through reason or inference, its validity must derive ultimately from some observed facts of experience