O, Silius, Silius, I have done enough

Ventidius
O, Silius, Silius,
I have done enough. A lower place, note well,
May make too great an act. For learn this, Silius:
Better to leave undone than by our deed
Acquire too high a fame when him we serve ‘s away.
Caesar and Antony have ever won
More in their officer than person. Sossius,
One of my place in Syria, his lieutenant,
For quick accumulation of renown,
Which he achieved by th' minute, lost his favor.
Who does i' th' wars more than his captain can
Becomes his captain's captain; and ambition,
The soldier's virtue, rather makes choice of loss
Than gain which darkens him.
I could do more to do Antonius good,
But ‘twould offend him. And in his offense
Should my performance perish.
Silius
Thou hast, Ventidius, that
Without the which a soldier and his sword
Grants scarce distinction. Thou wilt write to
Antony?
Ventidius
I'll humbly signify what in his name,
That magical word of war, we have effected;
How, with his banners and his well-paid ranks,
The ne'er-yet-beaten horse of Parthia
We have jaded out o' th' field.