It is difficult to recognize that which is good, unless you have seen that which is bad; I say it again, it is difficult to recognize that which is good, unless you have been that which is bad. (12/11/17)

It is difficult to recognize that which is good, unless you have seen that which is bad; I say it again, it is difficult to recognize that which is good, unless you have been that which is bad. (12/11/17)

“seen” or “”been”?
Which would you say?