In legal parlance, one who has personal knowledge of an event-that is, with opportunity to use either one of his normal senses, may be called as an ordinary witness. On the hand, one who has no personal knowledge may be called also as a witness to testify in his capacity as an expert witness. For example, a doctor may be called to testify on his expert view of a particular medical event, without personally witnessing such event. These types of witnesses are acceptable in establishing the truth. Considering that the present preachers of the "Word", e.g, Judaism, Catholicism, Christianity, Islam, etc, were not present before Christ departed 2000 years ago, then all them are professing to be "expert" witnesses. Now, let us test their expertise on the "Word" by citing a simple verse: " Do for others what you want them to do for you: this is the meaning of the Law of Moses and of the teachings of the prophets” ( Matthew 7:12, TEV...
