《旧唐书·列传·卷十六》
房玄龄遇到了太宗这位知己，便尽心尽力，出谋献策。
玄龄既遇知己，罄竭心力，知无不为。
Meeting Taizong, who recognized his talents, Fang Xuanling gave it his all, offering advice and strategies.
<s>[INST] Kindly elucidate the central themes in this passage in English: 玄龄既遇知己，罄竭心力，知无不为。 [/INST] Meeting Taizong, who recognized his talents, Fang Xuanling gave it his all, offering advice and strategies.</s>
Kindly elucidate the central themes in this passage in English: 玄龄既遇知己，罄竭心力，知无不为。
user
Meeting Taizong, who recognized his talents, Fang Xuanling gave it his all, offering advice and strategies.
assistant