See also two talks by Khan also from 1995, Mental Tests and Nature of Tests, and a 1995 letter from the Universal House of Justice on Mental Tests.
Audio posted online at http://bahaimp3.narod.ru/eng.htm
Documents posted between 2003-2012 had various slightly different URLs and sometimes can be found in archive.org with addresses like bahai-library.com/file.php5?file=khan_victories_crises.