to keep the full post while showing a featured image, edit this section in content.php:
<div class="entry-content">
<?php if ( '' != get_the_post_thumbnail() ) { ?>
<figure class="entry-thumb">
<a href="<?php the_permalink(); ?>"><?php the_post_thumbnail( forever_get_post_thumbnail_size() ); ?></a>
</figure><!-- .gallery-thumb -->
<?php the_excerpt(); ?>
<?php } else { ?>
<?php the_content( __( 'Continue reading <span class="meta-nav">→</span>', 'forever' ) ); ?>
<?php } // if ( '' != get_the_post_thumbnail() ) ?>
<?php wp_link_pages( array( 'before' => '<div class="page-links">' . __( 'Pages:', 'forever' ), 'after' => '</div>' ) ); ?>
</div><!-- .entry-content -->
and change it to:
<div class="entry-content">
<?php if ( '' != get_the_post_thumbnail() ) { ?>
<figure class="entry-thumb">
<a href="<?php the_permalink(); ?>"><?php the_post_thumbnail( forever_get_post_thumbnail_size() ); ?></a>
</figure><!-- .gallery-thumb -->
<?php }
the_content( __( 'Continue reading <span class="meta-nav">→</span>', 'forever' ) ); ?>
<?php wp_link_pages( array( 'before' => '<div class="page-links">' . __( 'Pages:', 'forever' ), 'after' => '</div>' ) ); ?>
</div><!-- .entry-content -->