Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Difficult to trust

Longman is an unashamed Calvinist. Those who share his beliefs may find this book very useful; others should take it with a large pinch of salt. His beliefs have an influence on his choice of books to review; while he does not ban all books by Catholic or Jewish writers, they are under-represented. More importantly, they affect his reviews. He classifies books as 1 to 5 stars and as suitable for laymen (L), ministers (M), scholars (S) or LM or MS. The only books recommended for LMS - and they are given a 5 star rating - are Calvin's commentaries. How useful these centuries-old works are to contemporary scholars is certainly debatable. Well-respected books by some authors are given poor ratings. Finally, just in case you cannot find his own books using the author index, they are helpfully listed on a page by themselves at the end.