What is the difference between speed and velocity? …..Well, speed is analogue, so something can be going at the same speed in any direction. Velocity is a vector, so something going at x mph west will cancel out something going at -x mph (east). Two cars travelling in opposite directions can have the same speed, but their net velocity will cancel each other out. I like to see the character of Paul in these terms..............

Matthew: Whose Gospel is it anyway?  For whom was it written and why?