serpent's egg
An allusion to Brutus's speech in Shakespeare's Julius
Caesar, Act II, Scene i:
Th'abuse of greatness is, when it disjoins
Remorse from power: and, to speak truth of Caesar,
I have not known when his affections sway'd
More than his reason. But 'tis a common proof,
That lowliness is young ambition's ladder,
Whereto the climber-upward turns his face;
But when he once attains the upmost round,
He then unto the ladder turns his back,
Looks in the clouds, scorning the base degrees
By which he did ascend: so Caesar may;
Then, lest he may, prevent. And, since the quarrel
Will bear no colour for the thing he is,
Fashion it thus; that what he is, augmented,
Would run to these and these extremities:
And therefore think him as a serpent's egg,
Which, hatch'd, would, as his kind, grow mischievous;
And kill him in the shell