Haplous – single, simple, sound, perfect.
The light of the body is the eye:if therefore thine eye be single, thy whole body shall be full of light. But if thine eye be evil, thy whole body shall be full of darkness. If therefore the light that is in thee be darkness, how great is that darkness! Matthew 6:22–23
Contrary to popular belief you cannot serve two masters, you will have to make a choice, if you want to be with the Lord you must have one single focus, a single desire because God is light and in Him there is no darkness
If we are light of the word then we too must be filled with light that comes from having a pure and simple desire to be with God, learning how to walk in His steps so that we can emanate to those around us perfect light that will indeed comprehend their darkness
A double minded person, one who attempt to serve two master is full of darkness and will only emanate darkness