In fact, there's quite a lot of practical and interesting insights into relationship, finances, discipline and more, for example the book of Proverbs is full of

In fact, there's quite a lot of practical and interesting insights into relationship, finances, discipline and more, for example the book of Proverbs is full of literal advice on dealing with family, children, marriage, business ethics. The letters of Paul to the Romans and Corinthians contain very interesting thought provoking statements on love, relationship, respect. Even if you remove faith completely from the picture you can definitely find very interesting content.