Which of the following lines by Juliet foreshadows the end of the play?

JULIET
Tell me not, friar, that thou hear'st of this,
Unless thou tell me how I may prevent it:
If, in thy wisdom, thou canst give no help,
Do thou but call my resolution wise,
And with this knife I'll help it presently.
God join'd my heart and Romeo's, thou our hands;
And ere this hand, by thee to Romeo seal'd,
Shall be the label to another deed,
Or my true heart with treacherous revolt
Turn to another, this shall slay them both:
Therefore, out of thy long-experienced time,
Give me some present counsel, or, behold,
'Twixt my extremes and me this bloody knife
Shall play the umpire, arbitrating that
Which the commission of thy years and art
Could to no issue of true honour bring.
Be not so long to speak; I long to die,
If what thou speak'st speak not of remedy.

1. Do thou but call my resolution wise,
2. And with this knife I'll help it presently
3. Unless thou tell me how I may prevent it:
4. Could to no issue of true honour bring.