Mathew 5:13 instructs us to be the salt and light the light of the earth or we will become useless.
"You are the salt of the earth; but if the salt has become tasteless, how can it be made salty again? It is no longer good for anything, except to be thrown out and trampled underfoot by men.
"You are the light of the world. A city set on a hill cannot be hidden; nor does anyone light a lamp and put it under a basket, but on the lamp stand, and it gives light to all who are in the house.”
Smile at yourself, and get a sense of humor. People who smile more have better overall health. When you smile, and speak positive words over your life –it feels amazing. Try it. “Say I am worthy, and beauty. I have peace today.” Get this into your daily activities. This will inspire you to uplift others as well. "Arise, shine; for your light has come, and the glory of the LORD has risen upon you (Isaiah 60:1).”
Read more at http://www.beliefnet.com/faiths/articles/how-to-channel-your-inner-light.aspx#yVmSXA9Eise0ogtA.99