15:57 Your victory is not a maybe; because of the magnanimous doing of Jesus Christ, it is a given! (But now in a single victorious stroke of Life, all three—sin, guilt, death—are gone, the gift of our Master, Jesus Christ. Thank God! — The Message.) 15:58 

For this reason you can afford to be absolutely settled and rock-solid in faith’s persuasion and always ready to go beyond where you would have gone before. 

Your doing now is inspired by your knowing that you are in him. 

If his resurrection is yours then his victory over sin and death is equally yours.