en_tn_condensed/eph/03/18.md

that you might be able to understand

This is the first item which Paul says will be the result of the Christians being rooted and grounded in Christ's love (Ephesians 3:17).

all God's holy people

"all believers in Christ" or "all the saints"

the width, the length, the height, and the depth

"how very wise God is" or "how much Christ loves us"