Brutus (1.3-1.4)

whereas this Brutus, of whom I now write, modified his disposition by means of the training and culture which philosophy gives, and stimulated a nature which was sedate and mild by active enterprises, and thus seems to have been most harmoniously attempered for the practice of virtue.

As a consequence, even those who hated him on account of his conspiracy against Caesar ascribed whatever was noble in the undertaking to Brutus, but laid the more distressing features of what was done to the charge of Cassius, who was a kinsman of Brutus, indeed, and his friend, but not so simple and sincere in his character.