Object Reference

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 public class TextHints : MonoBehaviour {
     Text text;
     public float timer = 0.0f;
     // Use this for initialization
     void Start () {
         text = GetComponent<Text>();
     }    
     // Update is called once per frame
 
     void Update () {
         if (text.enabled) {
             timer += Time.deltaTime;
         }
         if (timer >= 4) {
             text.enabled = false;
             timer = 0.0f;
         }
     }
     void ShowHint(string message){
 
     Text.text = message;
         if(!Text.enabled){
             Text.enabled = true;
     }
 }

Here's my code. I have errors on lines 24, 25, 26, saying I need an object reference. What is an object reference? I've looked up other solutions, but changing things to GameObjects doesn't work, unfortunately.