M. Tullius Cicero, Orations, The fourteen orations against Marcus Antonius (Philippics)
C. D. Yonge, Ed.

[2] But if deserved honors have been paid to any ambassador after death, there is no one by whom they can be found to have been ever more fully deserved than by Servius Sulpicius. The rest of those men who have died while engaged on an embassy, have gone forth, subject indeed to the usual uncertainties of life, but without any especial danger or fear of death. Servius Sulpicius set out with some hope indeed of reaching Antonius, but with none of returning. But though he was so very ill that if any exertion were added to his bad state of health, he would have no hope of himself, still he did not refuse to try, even while at his last gasp, to be of some service to the republic. Therefore neither the severity of the winter, nor the snow, nor the length of the journey, nor the badness of the roads, nor his daily increasing illness, delayed him. And when he had arrived where he might meet and confer with the man to whom he had been sent, he departed this life in the midst of his care and consideration as to how he might best discharge the duty which he had undertaken.