Just started one of Friedrich Nietzsche's finer works "On the Genealogy of Morality" It's worth a read if you enjoy 19th century philosophy. He was very ahead of his time Even Freud could only learn from him. WARNING: you may not want to read any of his works if your a person who doesn't want their faith challenged...Nietzsche's works cover the gaps and moral prejudices of Christianity and Judaism specifically.... Ps: maybe it's Better to have your faith tested every once in a while? Give it a look. I suggest starting with beyond good and evil (his most notable work) as the above mentioned book is a continuation of beyond good and evil.