99. Two ways may serve to settle our thoughts concerning issues of doubtful identity: the first is to submit communications to the severe test of reason, common sense and logic. This is the recommendation given by all good spirits, but one that is discouraged by deceitful spirits, who know very well that they can only lose with a serious examination. That is why they avoid discussion and want to be blindly believed.
The second criterion of true identity lies in the agreement of the teaching. When the same principle is taught in several places by different spirits and mediums who do not know each other and who are not under the same influence, we can conclude that it entails more truth than one coming from only one source and which contradicts the majority.