I certainly had not the smallest reason to fear that the execution of this murderer of Roman citizens would cause me to be blamed by posterity. And indeed, even if this were a serious danger, I have always been convinced that unpopularity earned by honourable actions is not unpopularity at all, but renown.
 
[Certe verendum mihi non erat, ne quid hoc parricida civium interfecto invidiae mihi in posteritatem redundaret. Quodsi ea mihi maxime inpenderet tamen hoc animo fui semper, ut invidiam virtute partam gloriam, non invidiam putarem.]

Marcus Tullius Cicero (106-43 BC) Roman orator, statesman, philosopher

Orationes in Catilinam [Catilinarian Orations], No. 1, § 12, cl. 29 (1.12.29) (63-11-08 BC) [tr. Grant (1960)]
    (Source)

(Source (Latin)). Alternate translations:

Truly I have no reason to fear, least this Murderer of the Citizens being slain, any envy should rise against me for the future. But if never so much did hang over me, yet I was alwayes of this Judgment, to think Envy gotten by Vertue to be no Envy but Glory.
[tr. Wase (1671)]

I could have no reason to fear; that for the execution of a traitor and a parricide I should stand condemned by the voice of posterity. But let me add, were the severest censure to be the certain consequence, it has ever been my settled opinion, that reproach, when earned by virtue, is not reproach, but the truest glory.
[tr. Sydney (1795)]

Surely I had no cause to fear lest for slaying this parricidal murderer of the citizens any unpopularity should accrue to me with posterity. And if it did threaten me to ever so great a degree, yet I have always been of the disposition to think unpopularity earned by virtue and glory, not unpopularity.
[tr. Yonge (1856)]

Surely it was not to be dreaded by me, lest, if this parricide of the citizens were slain, any odium might redound for me to posterity. But if that impended over myself in particular, yet I have always been of this opinion, that I should consider the odium acquired by merit as glory and not as odium.
[tr. Mongan (1879)]

Certainly it was not to be feared to (by) me, lest any (thing) of unpopularity might redound to me unto posterity, this parricide of citizens being slain. But if it might impend (threaten) to me mostly (very much), yet I have been always with this mind, that I might think envy produced by virtue, glory, not envy.
[tr. Underwood (1885)]

Certainly it was not to be feared by me, lest any ill-will should redound to [affect] me for posterity, this parricide of citizens having been slain. But if this should threaten me very much, yet I have been always with [of] this mind, that I should think ill will produced by virtue, glory, not ill will.
[tr. Dewey (1916)]

Certainly I did not have to fear, lest with this parricide of citizens having been killed, anything of unpopularity might run over in posterity. And yet, if these were to threaten me especially, however, I have always been in this mind, so that I thought that unpopularity obtained by virtue is an honour, not unpopularity at all.
[IB Notes]

I have always been of the opinion that infamy earned by doing what is right is not infamy at all, but glory.
[E.g.]