東大寺管長　清水公照の肉筆書
Todaiji President Kosho Shimizu's autograph

葉々清風
人との交流が清らかで、別れる時ですら清らかに別れるということ。
人別れる時にお互いに執着せず、爽やかに別れるという禅語。

It means that human relationships are clean and they are clean even if they are separated.
This Zen word says it is better for each person to live without being obsessed with parting with others.