'Certainty' in the Bible

that thou mightest know the certainty concerning the things wherein thou wast instructed.

And some shouted one thing, some another, among the crowd: and when he could not know the certainty for the uproar, he commanded him to be brought into the castle.

But on the morrow, desiring to know the certainty wherefore he was accused of the Jews, he loosed him, and commanded the chief priests and all the council to come together, and brought Paul down and set him before them.