All who are led by God’s Spirit are God’s sons and daughters. 15 You didn’t receive a spirit of slavery to lead you back again into fear, but you received a Spirit that shows you are adopted as his children. With this Spirit, we cry, “ Abba, Father. ” 16 The same Spirit agrees with our spirit, that we are God’s children. 17 But if we are children, we are also heirs. We are God’s heirs and fellow heirs with Christ, if we really suffer with him so that we can also be glorified with him.
Here's an accessible reference that aids personal Bible study or Sunday school preparation: "The Layman's Bible Commentary." Volume 5 covers Psalms through Song of Solomon, and gives you section-by-section commentary on the flow and theme of each book, as well as historical and literary context for each. Major interpretations are presented for controversial passages and topics. Puzzling passages and Bible practices are explained, and charts and diagrams further aid your understanding. "Take Home" segments provide a practical application for each passage.