Romeo speaking to Benvolio about his heartbreak with Rosaline.
When the devout religion of my eye maintains such falsehood, then turn tears to fire; And these who, often drowned, could never die, transparent heretics, be burnt for liars. One fairer than my love?
Herself poised with herself in either eye; But in that crystal scales let there be weighed your lady's love against some other maid.
Friar Lawrence foreshadowing Romeo and Juliet's love in a flower garden.
Within the infant rind of this weak flower poision hath residence and medicine power; for this being smelt, with that part cheers each part;
Mercutio just got killed by Tybalt in a duel that Romeo interfered in trying to make peace.
Thy beauty hath made me effeminate and in my temper softened valor's steel.
They have made worms' meat of me.
The evidence directly relates to deception because of the way people hide their emotions from others or only show part of what they are feeling. Romeo experienced terrible heartbreak and is forced to isolate himself from society and deceive them from finding out the true emotion he is feeling inside himself.
Friar Lawrence is telling the reader that Romeo and Juliet are doomed to fail in loving each other. To paraphrase, he says that Romeo is falling in love again too soon and their love will be "poisoned" because of it. This shows deception because this is all being represented through a flower making the reader need to pay attion in order to undersatnd the collusion.
The part that I want to focus on is what Romeo says. In this line, he has confessed that he has made a mistake in falling in love with Juliet because it has made him more weak as a man, or softer relating to the steel metaphor. This is an example of deception because had deceved himself into thinking his life would be perfect with Juliet.