In Tzotzil, a Mayan language spoken by about 200,000 Guatemalan Indians, there is a clitic, "la," that must be inserted in every statement that reports mere hearsay as opposed to what one has personally witnessed or experienced. This hearsay clitic is in the class of "evidentials," which qualify the commitment of the speaker to the claim being made. In English one can make similar qualifications, but it is not obligatory to do so. In Tzotzil, it is obligatory (Judith Aissen, personal communication, 27 December 2005). In the present world, in which we rely almost entirely on other sources for our knowledge, we would have to include a hearsay clitic in almost every sentence.