In Act 2, Scene 3, the Friar says something that is an example of the ends justifying the means. What is it and what does it mean?

The Friar isn't sure that marrying Romeo and Juliet is the right thing to do, as Romeo has proven himself impetuous.... he seems to easily fall in love. The Friar believes, however, that the marrige he isn't quite sure about, might just serve to end the feud between their families..... thus, the end would justify the means.