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add_action( 'sensei_before_main_content', 'sensei_conditional_lesson_display', 10 );

function sensei_conditional_lesson_display() {

	if( !is_singular('course') ) return;

	global $post, $current_user, $woothemes_sensei;
	$is_user_taking_course = Sensei_Utils::user_started_course( $post->ID, $current_user->ID );
	if ( ! ( $is_user_taking_course || sensei_all_access() ) ) {
	    	remove_action( 'sensei_single_course_content_inside_after' , array( 'Sensei_Course','the_course_lessons_title'), 9 );
		remove_action( 'sensei_single_course_content_inside_after', 'course_single_lessons', 10 );
	}

}