I think Friar Lawrence is trying to tell Romeo and Juliet that they are moving forward too fast in their relationship. Moving is to fast is always a stupid idea. Have you watched frozen? You could just fall in love with the guy that wants to kill you. Or you could pull a romeo and Juliet and kill yourself because your lover did it. We teenagers are stupid. We are trying to be independent before we have the rights to be independent so we make stupid choices. It is best to take things slowly and to find your love on your own time.