As for Marcus Cato

As for Marcus Cato, who was in general an upright man and displeased with any innovation but was able to exert no influence either by nature or by education, he did not himself make any complaint against the motion, but without going into particulars urged them to abide by the existing system and take no steps beyond it. At this Caesar was on the point of dragging Cato out of the very senate-house and casting him into prison. The latter gave himself up quite readily to be led away and not a few of the rest followed him; one of them, Marcus Petreius, being rebuked by Caesar because he was taking his departure before the senate was yet dismissed, replied: "I prefer to be with Cato in his cell rather than here with you." Abashed at this speech Caesar let Cato go and adjourned the senate, saying only this much in passing: "I have made you judges and lords of the law so that if anything should not suit you, it need not be brought into the public assembly; but since you are not willing to pass a decree, that body itself shall decide."

Dión Casio. Historia romana, 38, 3.