Jesus said that our light is not necessarily in the testimony of our words, but in the testimony of our deeds-our "good works." "Let your light so shine before men, that they may see your good deeds and glorify your Father who is in heaven."
"Ye are the salt of the earth: but if the salt has become tasteless, wherewith shall it be made salty again? It is no longer good for anything but to be cast out and trampled under foot by men. You are the light of the world. A city set on a hill cannot be hidden; neither do men light a lamp and put it under a bushel basket, but on a lampstand, and it gives light to all who are in the house. Let your light so shine before men, that they may see your good deeds and glorify your Father who is in heaven." (Mt 5:13-16)
"You are the salt of the earth." A Christian's job description is not only to guard his personal holiness, but also to touch the lives of everyone around him. At work we touch the lives of many people who do not find Christ in the church. It may be the most effective place to be a witness for Christ. However, we need to be careful about how we witness for Christ at work. We are paid to do our jobs and it would be dishonest with our employers to use work time for evangelism. Furthermore, it would be dishonorable to create divisions at work or a hostile environment for non-believers. We must avoid any possible contamination by seeking to promote ourselves through proselytizing. We are always at risk that our failures at work will bring shame to the name of Christ, especially if we appear to be enthusiastic to evangelize but deficient at work.