TPW 81 WLC Q70 thru 78 Justification Sanctification Final Salvation John Piper
Questions 70 thru 78 of the Westminster Larger Catechism are glorious and wonderful summaries of vital gospel and biblical truths.
https://www.pcaac.org/wp-content/uploads/2012/11/LargerCatechismwithScriptureProofs1.pdf