Literature Reference: 细人尚姑息，吾子色愈谨。—— 《赠郑十八贲》杜甫 The petty indulge in leniency, yet my son grows ever more cautious. From 'To Zheng Eighteen Bian' by Du Fu.
怀: Yearning and reminiscence, here signify family harmony and mutual care.
谨: Prudence, meticulousness. Caution, carefulness.
Meaning: Huai Jin signifies a heart full of caution, humility, and a restrained, composed character.