For ye were sometimes darkness, but now are ye light in the Lord: walk as children of light:
Ephesians 5:12–13 KJV 1900
For it is a shame even to speak of those things which are done of them in secret. But all things that are reproved are made manifest by the light: for whatsoever doth make manifest is light.
Fruit
Ephesians 5:9–11 KJV 1900
(For the fruit of the Spirit is in all goodness and righteousness and truth;) Proving what is acceptable unto the Lord. And have no fellowship with the unfruitful works of darkness, but rather reprove them.
Sleeping/Dead
Ephesians 5:14 KJV 1900
Wherefore he saith, Awake thou that sleepest, and arise from the dead, and Christ shall give thee light.
Conclusion
Each of these illustrations help to illustrate the relationship of the believer with the world before and after salvation
Darkness, but now light and children of light
Unfruitful works of darkness, but now fruit of the Spirit
