The two disciples on the road to Emmaus were bewildered about the empty tomb. While walking on the road, a strange man asked, "What are you discussing together as you walk along?" (Luke 24:13-17). Jesus makes us think by asking questions. By articulating our answers, our mind starts processing key issues so we can put things together.
Christ then moves from the head to heart where passion resides. Not only were these two disciples ignorant of who Christ was, they were "slow of heart to believe all that the prophets have spoken." Christ then explained the Scriptures to them (Luke 24:25-27).
After they invited Christ to stay with them and He broke bread, their hearts burned within them as He opened the Scripture to them (Luke 24:28-32). Passion comes as we spend time with Christ.
Do you have passion in life? If not, search the Scriptures, listen to what Christ has to say and then spend time with Him!