You believe that your friends and co-workers need Christ. But they must believe it too, or they will never turn to Him. This can be hard if their lives seem to be going along smoothly. How can you know what their inner struggles are? You can generally count on it that they struggle with the same kind of things as you do: making family relationships work, changing things about themselves that they don't like, wanting to make a difference in life, understanding tragedy. If you will make yourself vulnerable and look for ways to share how Christ is meeting you in these areas, God will show them that they too need Him.