Studying your hearers
It also would not be amiss to become acquainted, if possible, with his character. For, according as his temper is, harsh or mild, pleasant or grave, severe or easy, the cause should be made to incline toward the side which corresponds with his disposition, or to admit some mitigation or softening where it runs counter to it.
It may happen sometimes, too, that the judge is our enemy, or the opponent's friend. This is a circumstance requiring the circumspection of both parties, yet I think the favored advocate should behave with great caution, for a judge of a biased disposition will sometimes choose to pass sentence against his friends, or in favor of those to whom he bears enmity, that he may not appear to act with injustice.