Static using non-static

main.php

<?php
Test::myStaticMethod();

//Output : Fatal error: Using $this when not in object context in /var/www/.../main.php on line XXX

Test.class.php

<?php

class Test
{
  private $message;

  public function __construct()
  {
    $this->message = 'Omg this can be called?';
  }
  public static function myStaticMethod()
  {
    $this->myNotStatisMethod();
  }

  public function myNotStatisMethod()
  {
    echo $this->message;
  }
}