Plutarch. Plutarch's Lives of the Noble Grecians and Romans
Englished by Sir Thomas North. Trans. Sir Thomas North. Vol. 6 (1579; London: David Nutt, 1896) 238.

DION    which he had enterprised of his owne head and counsell: and 
AND    did amende the faults others committed, and brought things 
BRUTUS    to better state then he found them. Where it seemeth, that 
    Brutus did not wisely to receive the second battell: consider- 
    ing his rest stoode upon it. For, after he had lost the 
    battell, it was unpossible for him ever to rise againe: and 
    therefore his hart failed him, and so gave up all, and never 
    durst strive with his evill fortune as Pompey did, consider- 
    ing that he had present cause enough in the field to hope of 
    his souldiers, and being beside a dreadfull Lorde of all the 
    sea over. Furthermore, the greatest reproache they could 
    object against Brutus, was: that Iulius Caesar having saved 
    his life, and pardoned all the prisoners also taken in battell, as 
    many as he had made request for, taking him for his frende, 
    and honoring him above all his other frends: Brutus not- 
    withstanding had imbrued his hands in his blood, wherewith 
    they could never reprove Dion. For on the contrarie side, 
    so long as Dion was Dionysius frende and kinseman, he did 
    alway helpe him to order and governe his affaires. But 
    after he was banished his contrie, and that his wife was 
    forciblie maried to an other man, and his goodes also taken 
    from him: then he entred into just and open warres against 
In what    Dionysius the tyranne. But in this poynt, they were con- 
things Dion    trarie together. For wherein their chiefest praise consisted, 
was inferior    to witte, in hating of tyrannes and wicked men: it is most 
unto Brutus.    true that Brutus desire was most sincere of both. For 
    having no private cause of complaint or grudge against 
    Caesar, he ventred to kill him, onely to set his contrie 
    againe at libertie. Where if Dion had not received private 
    cause of quarrell against Dionysius: he woulde never have 
    made warre with him. The which Plato proveth in his 
    Epistells, where is plainlie seene: that Dion being driven 
    out of the tyrans Court against his will, and not putting 
    him selfe to voluntarie banishment, he drave out Dionysius. 
    Furthermore, the respect of the common wealth caused 
    Brutus, that before was Pompeys enemie, to become his 
    frende, and enemie unto Caesar, that before was his frend: 
    only referring his frendshippe and enmitie, unto the con- 
    sideracion of justice and equitie. And Dion did many