public final function display(string $text, int $tab = 0, string $highlighter = "*") {
    $_tab = null;
    for ($index = 0; $index < $tab; $index++) {
      $_tab .= $this->tabSpace;
    }
    echo("(" . Date("Y-m-d H:i:s") . ") | {$_tab}{$highlighter} {$text}" . PHP_EOL);
    return null;
  }