《元史·列传·卷八十九》
询问长生不老之道时，他指出以清心寡欲为要。
问长生久视之道，则告以清心寡欲为要。
When he asked about the path to eternal life, he said that the most important thing was to have a pure heart and few desires.
<s>[INST] Convert the following modern Chinese text into Classical Chinese: 询问长生不老之道时，他指出以清心寡欲为要。 [/INST] 问长生久视之道，则告以清心寡欲为要。</s>
Convert the following modern Chinese text into Classical Chinese: 询问长生不老之道时，他指出以清心寡欲为要。
user
问长生久视之道，则告以清心寡欲为要。
assistant