Where Do I Find Motivation?

So, I was just around very motivated, passionate Christians for the last few weeks.  It made street evangelism a lot easier because of the passion I felt.  Then it came... The realization that soon I'd be on my own.  But here is the truth, I am not on my own.  And boy did God start convicting me.  Where does my passion come from?  It comes not from passionate Christians.  It comes because Jesus died on the cross for my sins and the sins of the world.  This should give me passion enough to live the life style of a radical Christian all by myself.