Final answer:
Direct testimony is used when a speaker takes the central idea from a primary source, using exact words from primary documents, which is a reliable and strong form of evidence in affirming main points.
Step-by-step explanation:
If a speaker takes the central idea from a primary source, they are relying upon direct testimony. Direct testimony is the use of someone's exact words, which provide specific, concrete evidence from primary sources such as a diary entry, a historical document, or a personal letter. When a speaker uses direct quotation, it supports the main points with relevant details that are cited correctly, and is considered a strong form of evidence in both academic work and public discourse.
Testimony is considered broadly in philosophy and is not confined solely to legal proceedings. It includes any spoken or written utterance occurring in normal communication conditions. Testimony is a social means of gaining knowledge and can include a wide variety of sources, such as news articles, books, lectures, and more. Trustworthiness is key when evaluating testimony; it is important to consider if the source is honest, well-informed, rational, and an expert in the relevant field.