How can sin be rendered powerless, as Paul says in Romans 6:6? Consider the effect of gravity on a book. Gravity would cause an unsupported book to fall, but gravity can be rendered “powerless” against the book by simply placing a table under it. As long as the table is under the book, gravity cannot cause it to fall. Of course gravity has not really lost its power nor is it no longer present. It is just that the table is “stronger” than gravity’s effect on the book.
For the Christian, the Holy Spirit is like that table and our sin nature is like gravity’s pull. As long as we allow the Holy Spirit to hold us up, which places our dependence on his power to give us victory over sin, our sinful impulses have no power to pull us down.
Baker Books, 1500 Illustrations for Biblical Preaching, by Michael P. Green