《南史·列传·卷五十九》
任窻对父母兄弟非常孝敬友善，每次侍奉父母的病，夜间从没有脱衣休息过，一开口就流泪，汤药饮食都要先亲口尝一尝。
昉孝友纯至，每侍亲疾，衣不解带，言与泪并，汤药饮食必先经口。
Ren Kuan was very filial and friendly to his parents and brothers. Every time he served his parents' illness, he never took off his clothes and rested at night. He burst into tears when he spoke, and he had to taste the soup and food before he ate it.
<s>[INST] Kindly elucidate the central themes in this passage in English: 昉孝友纯至，每侍亲疾，衣不解带，言与泪并，汤药饮食必先经口。 [/INST] Ren Kuan was very filial and friendly to his parents and brothers. Every time he served his parents' illness, he never took off his clothes and rested at night. He burst into tears when he spoke, and he had to taste the soup and food before he ate it.</s>
Kindly elucidate the central themes in this passage in English: 昉孝友纯至，每侍亲疾，衣不解带，言与泪并，汤药饮食必先经口。
user
Ren Kuan was very filial and friendly to his parents and brothers. Every time he served his parents' illness, he never took off his clothes and rested at night. He burst into tears when he spoke, and he had to taste the soup and food before he ate it.
assistant