He is advising Romeo to think carefully and wisely about the decision to marry Juliet. This shows that he is wise because he is aware of what could happen.
Dramaticirony as the audience is aware that Romeo will 'stumble'
"Till holychurch incorporate two in one"
This shows his religiousviews and that he believe through marriage that the conflict between the two families will end through the eyes of god in Romeo and Juliet's marriage.