Biblical wisdom mostly. Certain parts definitely don’t hold up to modern morality, but there is a lot well-thought-out advice buried in it that has helped people in Judeo-Christian areas for thousands of years.
One of the Proverbs in particular comes to mind: “He who walks with the wise grows wise, but a companion of fools suffers harm.” Hard to argue against the inherent wisdom in such a statement.
Also, like you, I have an appreciation for old churches and some religious art.