Luke 11:35 states "Make sure that the light you think you have is not actually darkness."(NLT)
The implication is that a person can believe they have the light of the world as a motivation, but really be deceived. Ephesians 5:8-11 informs us of the fruit of the light which consist in all goodness, righteousness, and truth. Included with each shirt purchase is our light check print out with a few questions to see that our focus is in Christ.
The good news is God is merciful and all we need to do is humble ourselves, seek God's presence, and turn from anything revealed that is not rooted in the light. (2 Chronicles 7:14) Thank you and be blessed citizen of the King.