Here is the essay by Richard Muller on immutability.
Here is a handy PDF of the fourth edition of Mark Dever's Nine Marks of a Healthy Church.
Here are two readings by Helseth and Craig on providence, including responses by each to the other.
Here is the Baptist Faith and Message. It is actually the entire BFM. Section XVII is on marriage and family.
Here is the Catholic Catechism on Marriage.
Here is the Westminster Confession of Faith on marriage.
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