'Certainty' in the Bible

that thou mayest know the certainty of the things wherein thou wast instructed.

and some were crying out one thing, and some another, among the multitude, and not being able to know the certainty because of the tumult, he commanded him to be carried to the castle,

and on the morrow, intending to know the certainty wherefore he is accused by the Jews, he did loose him from the bonds, and commanded the chief priests and all their sanhedrim to come, and having brought down Paul, he set him before them.