adding logged_in to a custom page template

Hi,

I am trying to make a new custom page template that generates pages only for logged in users. I am having problems with the following code:

<?php
/**
 * Template Name: Secure Page
 *
 * @package WordPress
 */
get_header(); ?>

	<div id="primary" class="site-content">

		<div id="content" role="main">

<?php if (!is_user_logged_in()) {
   echo 'Welcome, this page is restricted to logged in users!';
} else {
			<?php while ( have_posts() ) : the_post(); ?>
				<?php get_template_part( 'content', 'page' ); ?>
				<?php comments_template( '', true ); ?>
			<?php endwhile; // end of the loop. ?>
	    }
endif; //end of if-loop.
?>

		</div><!-- #content -->
	</div><!-- #primary -->

<?php get_sidebar(); ?>
<?php get_footer(); ?>

Can anyone give me some pointers?

Thanks in advance!