Juliet: O, swear not by the moon, the inconstant moon, who monthly changes in her circled orb, lest that thy love prove likewise variable.
Romeo: What shall I swear by?
Juliet: Do not swear at all. Or, if thou wilt, swear by the gracious self which is the god of my idolatry, and I'll believe thee.
Sorry, couldn't help myself.