Galatians, chapter 4, verse 11
11 I am afraid on your account that perhaps I have labored for you in vain.
Have you ever when you have sinned and failed asked Christ please do not let me suffer the loss of your sacrifice for me. Has your fear been that Christ has labored for you in vain? This is what Paul was saying to the Galatians; he was crying for them not to throw the freedom that Christ had earned for them away by living in worldly ways. Our call is to be in the world but not of the world.
Jesus said to his disciples:
“You are the salt of the earth. But if salt loses its taste, with what can it be seasoned? It is no longer good for anything but to be thrown out and trampled underfoot. You are the light of the world.
A city set on a mountain cannot be hidden. Nor do they light a lamp and then put it under a bushel basket; it is set on a lampstand,
where it gives light to all in the house. Just so, your light must shine before others, that they may see your good deeds and glorify your heavenly Father.” (Mt 5:13-15)