折疑論 2.167

2.167

夫孝子之養老也。樂其心不違其志。樂其耳目（禮記內訓。曾子曰養親以養志為先。樂其心謂順適其心。故樂而無憂也。志則心之發動。有所欲矣。故又當先以意誠。使無違逆也。怡聲以問。所以樂其耳也。柔色以溫。所以樂其目也）。

Now, when a filial child cares for aging parents, he pleases their minds and does not oppose their will; he pleases their ears and eyes (The Book of Rites' 'Inner Lessons' says: Zengzi said, 'In nurturing parents, nurturing their will comes first.' 'Pleases their minds' means accommodating their minds so they are joyful and without sorrow. As for 'will', it is the activation of the mind, having that which it desires; hence one must also first be sincere in thought so that there is no opposition. Inquiring with a pleasant voice is the way to please their ears; warming them with a gentle expression is the way to please their eyes).