汾陽無德禪師語錄 2.305

2.305

「詰問一百則，從頭道理全，古今如目覩，有口不能詮。」室中請益古人公案，未盡善者，請以代之；語不格者，請以別之，故目之為代別。

"Interrogations numbering one hundred cases, / From beginning to end the principles are complete. / Past and present are like seeing with one's own eyes; / Though having a mouth, one cannot fully explain them."
When asking for further instruction in the master's room regarding the ancient masters' gong'ans, for those that are not entirely satisfactory, he asked to substitute for them; for words that do not hit the mark, he asked to differ from them. Hence they are titled 'Substitute and Alternative Phrases'.