When the going gets tough.

Remember, your light ultimately depends on what you are made up of. 
Remember they may try to choke you out of oxygen, extinguish your fire. 
But tell them stars never need oxygen to light the universe. They fuse nuclei to create something new. 

Thats it. Tell them you have always been a star. And look into their eyes and smile like a star.

One day your light will extinguish their darkness.