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) 221.

     him in better hart. And furthermore, bicause that someMARCUS
     of their owne men had already yelded them selves to theirBRUTUS
     enemies, and that it was suspected moreover divers others
     would doe the like: that made many of Cassius friendes,
     which were of his minde before, (when it came to be
     debated in counsell whether the battell shoulde be fought
     or not) that they were then of Brutus minde. But yet
     was there one of Brutus friendes called Atellius, that was
     against it, and was of opinion that they should tary theAtellius
     next winter. Brutus asked him what he should get byopinion for
     tarying a yeare lenger? If I get nought els, quoth Attel-the battell.
     lius agayne, yet have I lived so much lenger. Cassius was
     very angry with this aunswer: and Atellius was maliced
     and esteemed the worse for it of all men. Thereuppon it
     was presently determined they should fight battell the
     next daye. So Brutus all supper tyme looked with a
     cheerefull countenaunce, like a man that had good hope,
     and talked very wisely of Philosophie, and after supper
     went to bed. But touching Cassius, Messala reporteth
     that he supped by him selfe in his tent with a fewe of
     his friendes, and that all supper tyme he looked very
     sadly, and was full of thoughts, although it was against
     his nature: and that after supper he tooke him by the
     hande, and holding him fast (in token of kindnes as his
     manner was) tolde him in Greeke: Messala, I protest unto   Cassius words
     thee, and make thee my witnes, that I am compelledunto Messala,
     against my minde and will (as Pompey the great was)the night
     to jeopard the libertie of our contry, to the hazard of abefore the
     battel. And yet we must be lively, and of good corage,battell.
     considering our good fortune, whome we shoulde wronge
     too muche to mistrust her, although we followe evill
     counsell. Messala writeth, that Cassius having spoken
     these last wordes unto him, he bad him farewell, and
     willed him to come to supper to him the next night
     following, bicause it was his birth day. The next morning
     by breake of day, the signall of battell was set out inBrutus and
     Brutus and Cassius campe, which was an arming scarletCassius talke
     coate: and both the Chiefetaines spake together in thebefore the
     middest of their armies. There Cassius beganne to speakebattell.