Ninjas watch their targets closely.
In order to strike more effectively, ninjas observe their victims to learn their habits and patterns. What time does he eat breakfast or lunch? Where does he go in the evenings? What kind of protection does he have? Where does he live? And so on. The more the ninja knows about and understands his target, the better chance he has of succeeding.
When we're sharing the story of God, we also need to watch who we're talking to. Do you know a co-worker who needs to hear how much God loves them? What about a family member or a friend? Are you paying attention to those around you ? Do you know what they need and what challenges they are facing? Watch them. Find out who they are and what has happened in their lives. Then find a way to share Christ in a way that they will understand. Maybe the geek friend will understand it best if you compare Jesus to Superman. Maybe the single mom will understand best if you tell the story of the Samaritan woman at the well. Know your target. First, identify them as a target, then get to understand them. Your "victim" will appreciate it with their salvation.
Each of you should look not only to your own interests, but also to the interests of others. (Philippians 2:4)