Philo Judaeus Legatio Ad Gaium 213

[213] Petronius, having regard to these considerations, was very reluctant to attempt what he was commanded to do, considering what a great and wicked piece of daring he should be committing, and invoking all the deliberative powers of his soul as to a council, he inquired into the opinion of each of them, and he found every faculty of his mind agreeing that he should change nothing of these observances and customs which had been hallowed from the beginning of the world; in the first place because of the natural principles of justice and piety by which they were dictated, and secondly because of the danger which threatened any attempt at innovation upon them, not only from God, but also from the people who would be insulted by such conduct.