try
{
    // Set login credentials
    $credentials = array(
        'email'    => '[email protected]',
        'password' => 'test',
    );

    // Try to authenticate the user
    $user = Sentry::authenticate($credentials, false);
}
catch (Cartalyst\Sentry\Users\LoginRequiredException $e)
{
    echo 'Login field is required.';
}
catch (Cartalyst\Sentry\Users\PasswordRequiredException $e)
{
    echo 'Password field is required.';
}
catch (Cartalyst\Sentry\Users\WrongPasswordException $e)
{
    echo 'Wrong password, try again.';
}
catch (Cartalyst\Sentry\Users\UserNotFoundException $e)
{
    echo 'User was not found.';
}
catch (Cartalyst\Sentry\Users\UserNotActivatedException $e)
{
    echo 'User is not activated.';
}

// The following is only required if throttle is enabled
catch (Cartalyst\Sentry\Throttling\UserSuspendedException $e)
{
    echo 'User is suspended.';
}
catch (Cartalyst\Sentry\Throttling\UserBannedException $e)
{
    echo 'User is banned.';
}