Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A most revealing and fascinating biographical study

Elder Statesman: A Biography Of J. Reuben Clark by D. Michael Quinn is a thorough, solid, detailed and exhaustively comprehensive portrayal of Mormon church leader J. Reuben Clark. Amazingly informative and candid presented Elder Statesman is an outstanding biography that ranges from Clark's brush with atheism (one which he resolved by deciding that belief may be irrational yet is essential), to his view of African-Americans (he was once responsible for segregating blood donations by color), yet he was also one of the first of the Mormon hierarchy to advocate priesthood for African-Americans among the Latter-Day Saints. Elder Statesman is a most revealing and fascinating biographical study, and highly recommended reading for those with an interest in Mormon Studies.