What does Ephesians 3:18 mean?

Paul wants his readers to grow in understanding God's love (Ephesians 3:18), something which requires God-given spiritual strength. This applied to each person individually, both in the church at Ephesus and "with all the saints." Paul used the phrase "all the saints" eleven different times in his New Testament writings, always referring to entire groups of believers. The term is not used in the Bible as a reference to a special class of people, who are somehow more spiritual than others. Hebrews 13:24 uses a similar greeting to "all the saints." Revelation 8:3 speaks of the "prayers of all the saints" in heaven.

Paul then poetically notes the extent of God's love, including every possible physical dimension. He used similar wording in Romans 8:38–39: "For I am sure that neither death nor life, nor angels nor rulers, nor things present nor things to come, nor powers, nor height nor depth, nor anything else in all creation, will be able to separate us from the love of God in Christ Jesus our Lord." The Old Testament often used "height and depth" regarding measurements. Paul used these figurative terms in relationship to God's love that cannot be measured, though believers can grow in their understanding of God's love.