Jesus told His disciples that the world would know that they are His disciples by their love for others. Love for others is the proof of a sincere relationship with Christ. Love is the Light of Christ that shines from us to others who still need to know Christ.
The Apostle Paul in I Corn. 13 says that "Love is patient" - therefore I like to say that "Missional Living is Patient". Watch this video and then evaluate yourself and ask how loving or patient are you with those who still need to know Christ.