It's important to remember that Juliet is a 13-year-old girl when the play opens. She looks to the Friar as a trusted and reliable source of guidance. When she shows up for her marriage, the good Friar wastes no time:
Come, come with me, and we will make short work,
For, by your leaves, you shall not stay alone
Till Holy Church incorporate two in one. (2.6.35–37)
For a holy man to guide a (very) young girl in deliberately disobeying her parents and to hide the truth from them himself is not an example of providing wise (or holy) counsel.
Friar Laurence also uses the couple as a pawn piece to bring about peace between the families. In act 2, scene 3, the Friar is scoffing at Romeo for so quickly forgetting his feelings for Rosaline. Yet he seems to have a sudden change of heart in these lines:
In one respect I’ll thy assistant be,
For this alliance may so happy prove
To turn your households’ rancor to pure love. (2.3.93–95)
He goes on to caution Romeo to move slowly, but his own involvement...
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