Leverett S. Lyon,
Elements of Debating: A Manual for Use in High Schools and Academies
“ Remember, then, as the fundamental rule, that the judges and audience will believe the issues of the proposition, and, as a result, the proposition itself, only when we show them, by the standard of their own experience, that we are right.The reasons that we give in support of the issues are, in debating, called evidence. Evidence is not proof; evidence is the material out of which proof is made. Evidence is like the separate stones of a solid wall: no one alone makes the wall; each one helps make it strong. ”

