《资治通鉴·唐纪·唐纪四十八》
韩游说： 吐蕃削弱的时候才请求会盟，强盛的时候便侵犯内地。现在，吐蕃深入到边界之内，反而请求盟会，这一定是在骗人！ 
韩游瑰曰： 吐蕃弱则求盟，强则入寇，今深入塞内而求盟，此必诈也！ 
Han You said: Tufan only asked for an alliance when it was weak, and invaded the interior when it was strong. Now that Tufan has penetrated into the border, but asks for an alliance instead, it must be trying to deceive people!