Yet hold, a word!

[The PAGE returns. CARLOS lays his hand on his shoulder, and looks
him steadily in the face.

A direful secret hast thou in thy keeping,
Which, like a poison of terrific power,
Shivers the cup that holds it into atoms.
Guard every look of thine, nor let thy head
Guess at thy bosom's secret. Be thou like
The senseless speaking-trumpet that receives
And echoes back the voice, but hears it not.
Thou art a boy! Be ever so; continue
The pranks of youth. My correspondent chose
Her messenger of love with prudent skill!
The king will ne'er suspect a serpent here.

PAGE.
And I, my prince, shall feel right proud to know
I am one secret richer than the king.

CARLOS.
Vain, foolish boy! 'tis this should make thee tremble.
Approach me ever with a cold respect:
Ne'er be induced by idle pride to boast
How gracious is the prince! No deadlier sin
Canst thou commit, my son, than pleasing me.
Whate'er thou hast in future for my ear,
Give not to words; intrust not to thy lips,