# you bless God ... you are giving thanks ... you are saying

Paul is addressing everyone who prays only in the spirit, but not with the mind. 

# how will the outsider say "Amen" ... saying?

"the outsider will never be able to say 'Amen' ... saying." 

# the outsider

"another person" or "people who are new to your group."

# say "Amen"

"agree"