public function teaser($text, $enable_filter = true, $filter_id = null)
    {
        $summary = '';

        if ($text !== '') {
            $parts = $this->explodeText($text);
            $summary = reset($parts);
        }

        if ($summary !== '' && $enable_filter) {
            $summary = $this->filter($summary, $filter_id);
        }

        return $summary;
    }