GUI Label not drawing on screen

I'm Trying to get a label to display text that changes when the player crosses checkpoints in a tutorial level, but it's not showing up. Any ideas what I've done wrong here?

Tutorial Manager Script:

 public var checkpoints : Transform[];
 private var temp : boolean;
 private var temp2 : Transform;
 private var cPointed : int = 0;
 private var say : String;
 
 
 function Update () {
     for(i = 0; i <= checkpoints.Length; i++){
         temp2 = checkpoints[i];
         temp = temp2.transform.GetComponent("Checkpoint").returnCrossed();
         if(temp == true){
             cPointed++;
         }
     }
     passed(cPointed);
     OnGUI();
 }
 
 function passed(passed : int){
     if(passed == 1){
         say = "Use the Right Analog Stick to Move the Camera";
     }
     if(passed == 2){
     
     }
     if(passed == 3){
     
     }
     if (passed== 0){
         say = "Use the Left Analog Stick to Move";
     }
     
 }
 
 function OnGUI(){
 
     GUI.Label(Rect(Screen.width-Screen.width, Screen.height - Screen.height/5, Screen.width /2.5f, Screen.height/5),  say );
 }

And the Checkpoint Script:

 private var crossed: boolean;
 private var player : Transform;
 
 function Awake(){
     player = GameObject.FindWithTag("Player").transform;
     crossed = false;
 }
 function OnTriggerEnter (other : Collider) {
         if(other.tag == "Player"){
             crossed = true;
             }
         }
 function Update () {
 }
 
 function returnCrossed(){
     return crossed;
 }