《世说新语·捷悟》
杨德祖担任魏武帝曹操的主簿，当时正在修建相国府的大门，刚刚架好椽子，曹操就亲自出来看，并且叫人在门上写个 活 字，就走了。
杨德祖为魏武主簿，时作相国门，始构榱桷，魏武自出看，使人题门作 活 字，便去。
Yang Dezu served as the main secretary for Cao Cao, the Martial Emperor of Wei. At that time, the grand gate of the Xiangguo mansion was being built. As soon as the rafters were set up, Cao Cao personally came out to take a look and ordered someone to write the character "Alive" on the gate before he left.