From the Celtic Book of Prayer:
Call: Who is it that you seek?
Response: We seek the Lord our God.
Call: Do you seek Him with all your heart?
Response: Amen. Lord, have mercy.
Call: Do you seek Him with all your soul?
Response: Amen. Lord, have mercy.
Call: Do you seek Him with all your mind?
Response: Amen. Lord, have mercy.
Call: Do you seek Him with all your strength?
Response: Amen. Christ, have mercy.