|Wikipedia=Henry van Dyke
::- ''Use whatever talent you possess. The woods would be very silent if no birds sang there except those that sang best.''
:::- ''Henry van Dyke citado em "Handicapped Individuals Services and Training Act: hearing before the Subcommittee on Select Education of the Committee on Education and Labor, House of Representatives, Ninety-seventh Congress, second session, on H.R. 6820 ... hearing held in St. Paul, Minn., and Loretto, Minn. on September 2, 1982" - Página 223, de United States. Congress. House. Committee on Education and Labor. Subcommittee on Select Education - U.S. G.P.O., 1982 - 257 páginas''