Lately I've become a bit more selective of when I say "amen". (It's not a passive thing to me--I want it to mean something and not be taken for granted). Here is a prayer to which I have no reservations saying amen--meaning, this is my prayer also:
"
My prayer is that the Lord will give me discernment; that He will bless me to be honest, frank, and courageous when those are required, and to be discreet, understanding, and sensitive when those qualities are appropriate." --Leonard Arrington, p. 94 of "Adventures of a Church Historian"