Final answer:
Juliet's thoughts before taking the Friar's potion are filled with fear and doubt, but her love for Romeo and desperation to avoid marrying Paris drive her to follow through with the plan.
Step-by-step explanation:
Before Juliet carries out the Friar's plan in Shakespeare's play Romeo and Juliet, she is plagued by intense fears and doubts. Juliet's thoughts are a whirlwind of worry about the possibility of the potion not working, waking up alone in the tomb, or going insane due to the maddening terror of being amongst the dead. Her passionate desire to be reunited with Romeo and her fear of the marriage to Paris are what ultimately propel her into following through with the Friar's risky scheme.